Anatomy and Physiology Questions

The best high school and college tutors are just a click away, 24×7! Pick a subject, ask a question, and get a detailed, handwritten solution personalized for you in minutes. We cover Math, Physics, Chemistry & Biology.
Rh incompatibility between a sensitized Rh woman and an Rh fetus can cause hemolytic disease of the newborn True or False True False
Anatomy and Physiology
Introduction to Physiology
Rh incompatibility between a sensitized Rh woman and an Rh fetus can cause hemolytic disease of the newborn True or False True False
Multiple Choice O O O O O right AV tricuspid and pulmonary valves right AV tricuspid valve only left AV mitral and aortic valves left AV mitral valve only pulmonary and aortic valves
Anatomy and Physiology
Endocrinology
Multiple Choice O O O O O right AV tricuspid and pulmonary valves right AV tricuspid valve only left AV mitral and aortic valves left AV mitral valve only pulmonary and aortic valves
Blood flow through a capillary bed is regulated by precapillary sphincters True or False True False
Anatomy and Physiology
Circulation
Blood flow through a capillary bed is regulated by precapillary sphincters True or False True False
ich of the following is not a possible circulatory route from the heart Multiple Choice O O O O O Heart arteries capillary bed veins heart Heart arteries capillary bed vein capillary bed veins heart Heart arteries capillary bed vein capillary bed arteries heart Heart arteries arterial anastomosis capillary bed veins heart Heart arteries arterial anastomosis capillary bed venous anastomosis vei heart
Anatomy and Physiology
Abdomen
ich of the following is not a possible circulatory route from the heart Multiple Choice O O O O O Heart arteries capillary bed veins heart Heart arteries capillary bed vein capillary bed veins heart Heart arteries capillary bed vein capillary bed arteries heart Heart arteries arterial anastomosis capillary bed veins heart Heart arteries arterial anastomosis capillary bed venous anastomosis vei heart
O 32 21 The lungs Multiple Choice O O O valve regulates the flow of blood between the right ventricle and the vessels leading to the O right atrioventricular left atrioventricular aortic pulmonary mitral
Anatomy and Physiology
Introduction to Physiology
O 32 21 The lungs Multiple Choice O O O valve regulates the flow of blood between the right ventricle and the vessels leading to the O right atrioventricular left atrioventricular aortic pulmonary mitral
Multiple Choice O O O O O Increased viscosity Increased blood pressure Increased vessel radius Increased afterload Decreased vasomotion
Anatomy and Physiology
Head and Neck
Multiple Choice O O O O O Increased viscosity Increased blood pressure Increased vessel radius Increased afterload Decreased vasomotion
The area where the major vessels lead to and from the heart s chambers is called the heart The pointy inferior portion is called the Multiple Choice O O O O apex base atrium ventricle ventricle atrium base apex endocardium epicardium
Anatomy and Physiology
Brain
The area where the major vessels lead to and from the heart s chambers is called the heart The pointy inferior portion is called the Multiple Choice O O O O apex base atrium ventricle ventricle atrium base apex endocardium epicardium
Incompatibility of one person s blood with another results from the action of plasma antibodies against RBCS antigens True or False True False
Anatomy and Physiology
Introduction to Physiology
Incompatibility of one person s blood with another results from the action of plasma antibodies against RBCS antigens True or False True False
5 In people who stand for long periods blood tends to pool in the lower limbs and this may result in varicos veins What causes the varicose veins Multiple Choice O O O An aneurysm or weak point in an artery An aneurysm or weak point in a vein Failure of the venous valves Failure of the lymphatic valves A ruptured aneurysm in a vein
Anatomy and Physiology
Abdomen
5 In people who stand for long periods blood tends to pool in the lower limbs and this may result in varicos veins What causes the varicose veins Multiple Choice O O O An aneurysm or weak point in an artery An aneurysm or weak point in a vein Failure of the venous valves Failure of the lymphatic valves A ruptured aneurysm in a vein
21 What is the most abundant protein in plasma Multiple Choice O O O O Insulin Creatine Bilirubin Albumin
Anatomy and Physiology
Embryo
21 What is the most abundant protein in plasma Multiple Choice O O O O Insulin Creatine Bilirubin Albumin
19 Where is the greatest volume of blood found in the body Multiple Choice O O O O Pulmonary circuit Heart Arteries Veins O Capillaries
Anatomy and Physiology
Abdomen
19 Where is the greatest volume of blood found in the body Multiple Choice O O O O Pulmonary circuit Heart Arteries Veins O Capillaries
Multiple Choice O sympathetic division of the nervous system O O O O autonomic nervous system sinuatrial SA node atrioventricular AV node cardiac conduction system
Anatomy and Physiology
Introduction to Physiology
Multiple Choice O sympathetic division of the nervous system O O O O autonomic nervous system sinuatrial SA node atrioventricular AV node cardiac conduction system
The heart Multiple Choice O are the superior chambers of the heart and the O visceral layers of the serous percardiaum parietal layers of the serous pericardium ventricles atria atria ventricles left ventricles right ventricles are the inferior chambers left atria right atria
Anatomy and Physiology
Abdomen
The heart Multiple Choice O are the superior chambers of the heart and the O visceral layers of the serous percardiaum parietal layers of the serous pericardium ventricles atria atria ventricles left ventricles right ventricles are the inferior chambers left atria right atria
Multiple Choice fibrous skeleton pericardial cavity endocardium myocardium epicardium rk of the heart
Anatomy and Physiology
Abdomen
Multiple Choice fibrous skeleton pericardial cavity endocardium myocardium epicardium rk of the heart
D 5 The apex of the heart is found Multiple Choice O O to the right to the left in the center of the midline of the be
Anatomy and Physiology
Abdomen
D 5 The apex of the heart is found Multiple Choice O O to the right to the left in the center of the midline of the be
3 40 Which of the following is not contained in the butty coat Multiple Choice O O Lymphocytes Granulocytes Erythrocytes Agranulocytes Platelets
Anatomy and Physiology
Introduction to Physiology
3 40 Which of the following is not contained in the butty coat Multiple Choice O O Lymphocytes Granulocytes Erythrocytes Agranulocytes Platelets
Multiple Choice O O Pulmonary veins and vena cavae Aorta and pulmonary veins Aorta and vena cavae Venae cavae and pulmonary arteries Pulmonary veins and pulmonary arteries
Anatomy and Physiology
Abdomen
Multiple Choice O O Pulmonary veins and vena cavae Aorta and pulmonary veins Aorta and vena cavae Venae cavae and pulmonary arteries Pulmonary veins and pulmonary arteries
Multiple Choice O Transports a variety of nutrients O O Participates in the initiation of blood clotting O Helps to stabilize the pH of extracellular fluids O Produces plasma hormones Helps to regulate body temperature
Anatomy and Physiology
Abdomen
Multiple Choice O Transports a variety of nutrients O O Participates in the initiation of blood clotting O Helps to stabilize the pH of extracellular fluids O Produces plasma hormones Helps to regulate body temperature
You are going to the gym daily and lifting weights to bulk up As you lift weights more and more contractile proteins are being stored in your skeletal muscle cells This chemical reaction is an example of an O endergonic reaction Catabolic reaction Try again exergonic reaction activation energy
Anatomy and Physiology
Abdomen
You are going to the gym daily and lifting weights to bulk up As you lift weights more and more contractile proteins are being stored in your skeletal muscle cells This chemical reaction is an example of an O endergonic reaction Catabolic reaction Try again exergonic reaction activation energy
Compare the two scenarios Describe your general observations about the differences in these two scenarios
Anatomy and Physiology
Introduction to Physiology
Compare the two scenarios Describe your general observations about the differences in these two scenarios
1 in the nucleus 2 on a chromosome on a gene 31 EN on a nucleotide 5 on a ribosome 6 on the smooth endoplasmic reticulum
Anatomy and Physiology
General Anatomy
1 in the nucleus 2 on a chromosome on a gene 31 EN on a nucleotide 5 on a ribosome 6 on the smooth endoplasmic reticulum
0 1 pupil 02 cornea 3 lens 4 retina anges structure during the accommodation reflex uestion 18 2 points In myopia Saved 1 the eyeball is shorter 2 the focal point is behind the retina 3 patients see objects far away
Anatomy and Physiology
Abdomen
0 1 pupil 02 cornea 3 lens 4 retina anges structure during the accommodation reflex uestion 18 2 points In myopia Saved 1 the eyeball is shorter 2 the focal point is behind the retina 3 patients see objects far away
Question 14 2 points Fluid waves causing bending
Anatomy and Physiology
Circulation
Question 14 2 points Fluid waves causing bending
Question 12 2 points In hearing which of the follow 1 auditory nerve 21 hrain
Anatomy and Physiology
Abdomen
Question 12 2 points In hearing which of the follow 1 auditory nerve 21 hrain
estion 5 2 points hich of the following is a somatic sense which uses mechanoreceptors 1 temperature 2 equilibrium 3 olfaction 4 proprioception estion 6 2 points Which of the following is a similarity between gustation and equilibrium Both 1 have sensors which signal to primary sensory neurons 2 use chemoreceptors 3 have sensors which are neurons
Anatomy and Physiology
General Anatomy
estion 5 2 points hich of the following is a somatic sense which uses mechanoreceptors 1 temperature 2 equilibrium 3 olfaction 4 proprioception estion 6 2 points Which of the following is a similarity between gustation and equilibrium Both 1 have sensors which signal to primary sensory neurons 2 use chemoreceptors 3 have sensors which are neurons
auditory canal pinna semicircular canals 5 incus on 10 2 points um carbonate crystals or otoliths are located in the 1 cochlea 2 auditory canal 3 inner ear 4 middle ear
Anatomy and Physiology
Abdomen
auditory canal pinna semicircular canals 5 incus on 10 2 points um carbonate crystals or otoliths are located in the 1 cochlea 2 auditory canal 3 inner ear 4 middle ear
ange in lens shape 6 2 points which of the following is a sensor d anglion neuron polar neuron ptic nerve
Anatomy and Physiology
Introduction to Physiology
ange in lens shape 6 2 points which of the following is a sensor d anglion neuron polar neuron ptic nerve
Question 2 2 points Which of the following is a similarity b O 1 predict the movement of water O2 describe solute concentrations
Anatomy and Physiology
Abdomen
Question 2 2 points Which of the following is a similarity b O 1 predict the movement of water O2 describe solute concentrations
Jizaya a victim of rape is being treated by her psychologist through a technique called eye movement desensitization reprocessing EMDR followed by virtually exposing her to her most feared and hated situation These methods of psychological treatment are most effective for post traumatic stress disorders acute stress disorders Ospecific phobias
Anatomy and Physiology
Brain
Jizaya a victim of rape is being treated by her psychologist through a technique called eye movement desensitization reprocessing EMDR followed by virtually exposing her to her most feared and hated situation These methods of psychological treatment are most effective for post traumatic stress disorders acute stress disorders Ospecific phobias
Sam is a 54 year old man whose wife died recently Within the same year he was diagnosed with chronic obstructive pulmonary disease Six months following he was dismissed from work as a construction worker because he could keep up with demands of the job He had to sell his house and move to a different city Sam became socially isolated and lost his appetite If Sam were to take the Social Readjustment Rating Scale the score might indicate that he is at risk for developing O mental health problems O panic disorder O a personality disorder job burnout
Anatomy and Physiology
G.I Tract
Sam is a 54 year old man whose wife died recently Within the same year he was diagnosed with chronic obstructive pulmonary disease Six months following he was dismissed from work as a construction worker because he could keep up with demands of the job He had to sell his house and move to a different city Sam became socially isolated and lost his appetite If Sam were to take the Social Readjustment Rating Scale the score might indicate that he is at risk for developing O mental health problems O panic disorder O a personality disorder job burnout
Connie was a victim of domestic violence for 10 years She decided to do exposure therapy when she started having flashbacks of the trauma she had experienced Her husband had severely abused her and she had had several hospitalizations as a result of kicks to her abdomen stab wounds and burns One day two years after leaving the abusive relationship she recalled feeling the pain of her broken arm that had already healed Connie was being treated for which disorder panic disorder agoraphobia OCD Opost traumatic stress disorder
Anatomy and Physiology
Brain
Connie was a victim of domestic violence for 10 years She decided to do exposure therapy when she started having flashbacks of the trauma she had experienced Her husband had severely abused her and she had had several hospitalizations as a result of kicks to her abdomen stab wounds and burns One day two years after leaving the abusive relationship she recalled feeling the pain of her broken arm that had already healed Connie was being treated for which disorder panic disorder agoraphobia OCD Opost traumatic stress disorder
Which type of attachment is seen most often in kids who have been abused or severely neglected secure attachment O insecure avoidant attachment Odisorganized attachment O resistant attachment
Anatomy and Physiology
Abdomen
Which type of attachment is seen most often in kids who have been abused or severely neglected secure attachment O insecure avoidant attachment Odisorganized attachment O resistant attachment
Audrey was a victim of molestation when she was 18 years old Her medical evaluation revealed that she possesses two short versions of a gene that regulates the neurotransmitter serotonin Audrey is at a significantly higher risk of developing O agoraphobia O excoriation disorder generalized anxiety disorder OPTSD
Anatomy and Physiology
Circulation
Audrey was a victim of molestation when she was 18 years old Her medical evaluation revealed that she possesses two short versions of a gene that regulates the neurotransmitter serotonin Audrey is at a significantly higher risk of developing O agoraphobia O excoriation disorder generalized anxiety disorder OPTSD
11 Gloria lives in a care facility She has been diagnosed with middle stage dementia and still enjoys singing Gloria has begun to wander at night and often becomes upset when staff tries to get her to go back to her room What intervention would be considered person centered care Singing songs with Gloria as she is guided back to her room Telling Gloria that she needs to go to her room so she does not disturb others O Preventing Gloria from taking afternoon naps so she is sleepier at night O Giving Gloria towels to fold at the nurse s station so staff can keep an eye on her 12 Oscar who has middle stage dementia has joined art class today and the group is painting with watercolors The activity staff puts a piece of paper paints a cup of water and a brush in front of Oscar and welcomes him to the activity Oscar sits at the table for a few minutes watching others but does not paint What is the BEST next step the staff can take to help Oscar Tell Oscar to watch the others and do what they are doing Take away Oscar s painting supplies he does not look interested O Place the brush in Oscar s hand and demonstrate the next step Give Oscar some crayons instead since he does not know how to paint 13 What is the BEST step caregivers can take to prevent dehydration in people Offer a person their favorite drinks often throughout the day Ask them to drink a full glass of water at each meal Tell them you are tracking how much they drink dem
Anatomy and Physiology
Introduction to Physiology
11 Gloria lives in a care facility She has been diagnosed with middle stage dementia and still enjoys singing Gloria has begun to wander at night and often becomes upset when staff tries to get her to go back to her room What intervention would be considered person centered care Singing songs with Gloria as she is guided back to her room Telling Gloria that she needs to go to her room so she does not disturb others O Preventing Gloria from taking afternoon naps so she is sleepier at night O Giving Gloria towels to fold at the nurse s station so staff can keep an eye on her 12 Oscar who has middle stage dementia has joined art class today and the group is painting with watercolors The activity staff puts a piece of paper paints a cup of water and a brush in front of Oscar and welcomes him to the activity Oscar sits at the table for a few minutes watching others but does not paint What is the BEST next step the staff can take to help Oscar Tell Oscar to watch the others and do what they are doing Take away Oscar s painting supplies he does not look interested O Place the brush in Oscar s hand and demonstrate the next step Give Oscar some crayons instead since he does not know how to paint 13 What is the BEST step caregivers can take to prevent dehydration in people Offer a person their favorite drinks often throughout the day Ask them to drink a full glass of water at each meal Tell them you are tracking how much they drink dem
7 Nelson has late stage dementia uses a wheelchair and no longer communicates What step is BEST when helping Nelson get dressed in the morning O Give Nelson a choice of two outfits and ask him what he wants to wear Introduce yourself and tell Nelson that you are going to get him dressed O Leave Nelson in his pajamas all day getting dressed takes too much time Make sure Nelson is wearing clothing that does not have buttons or ties
Anatomy and Physiology
Introduction to Physiology
7 Nelson has late stage dementia uses a wheelchair and no longer communicates What step is BEST when helping Nelson get dressed in the morning O Give Nelson a choice of two outfits and ask him what he wants to wear Introduce yourself and tell Nelson that you are going to get him dressed O Leave Nelson in his pajamas all day getting dressed takes too much time Make sure Nelson is wearing clothing that does not have buttons or ties
Liana has been pulling out her hair for two years This habit occurs to such a degree that her hair loss can be seen All her efforts to stop pulling her hair typically fail Which of the following disorders is Liana most likely to have O body dysmorphic disorder O trichotillomania O generalized anxiety disorder O social anxiety disorder
Anatomy and Physiology
Infex
Liana has been pulling out her hair for two years This habit occurs to such a degree that her hair loss can be seen All her efforts to stop pulling her hair typically fail Which of the following disorders is Liana most likely to have O body dysmorphic disorder O trichotillomania O generalized anxiety disorder O social anxiety disorder
Richard a 60 year old gardener lives alone in his one bedroom shack amid stacks of newspapers loomed just at shoulder height topped with magazines bottles cartons and grocery packaging Alarmingly around the gas cooker where he makes his frugal repast of boiled eggs and toast a pile of paper and packaging fills this area of his home from floor to ceiling Most of the things he has collected have no value nonetheless he has severe anxiety at the thought of throwing them out even if they represent a fire risk putting his life in danger He was referred to a community mental health team and diagnosed with hoarding disorder O major depressive disorder O antisocial personality disorder obsessive compulsive disorder
Anatomy and Physiology
Brain
Richard a 60 year old gardener lives alone in his one bedroom shack amid stacks of newspapers loomed just at shoulder height topped with magazines bottles cartons and grocery packaging Alarmingly around the gas cooker where he makes his frugal repast of boiled eggs and toast a pile of paper and packaging fills this area of his home from floor to ceiling Most of the things he has collected have no value nonetheless he has severe anxiety at the thought of throwing them out even if they represent a fire risk putting his life in danger He was referred to a community mental health team and diagnosed with hoarding disorder O major depressive disorder O antisocial personality disorder obsessive compulsive disorder
Sheila a 26 year old single female who lives with her family was admitted to an outpatient department of psychiatry Sheila suffered from childhood sexual abuse when she was nine years old The abuse lasted for four years She presented complaints of excessive skin scratching of the fingers forearms and upper back for the last three years However in the past two years the picking has been a daily routine which was associated with emotional stress followed by a feeling of relief after picking She had been treated by her general practitioner and dermatologist for approximately two years although none of the therapies provided a complete clinical result Eventually Sheila was diagnosed as having O excoriation skin picking disorder Oborderline personality disorder O post traumatic stress disorder O obsessive compulsive disorder
Anatomy and Physiology
Brain
Sheila a 26 year old single female who lives with her family was admitted to an outpatient department of psychiatry Sheila suffered from childhood sexual abuse when she was nine years old The abuse lasted for four years She presented complaints of excessive skin scratching of the fingers forearms and upper back for the last three years However in the past two years the picking has been a daily routine which was associated with emotional stress followed by a feeling of relief after picking She had been treated by her general practitioner and dermatologist for approximately two years although none of the therapies provided a complete clinical result Eventually Sheila was diagnosed as having O excoriation skin picking disorder Oborderline personality disorder O post traumatic stress disorder O obsessive compulsive disorder
Whenever Tania eats at a restaurant she thinks about the number of people who may have touched her silverware When no one is looking she puts the silverware into her pocket goes to the ladies room and washes the silverware in hot water several times without ever feeling like they are clean Tania might be suffering from body dysmorphic disorder obsessive compulsive disorder generalized anxiety disorder an anxiety disorder
Anatomy and Physiology
Circulation
Whenever Tania eats at a restaurant she thinks about the number of people who may have touched her silverware When no one is looking she puts the silverware into her pocket goes to the ladies room and washes the silverware in hot water several times without ever feeling like they are clean Tania might be suffering from body dysmorphic disorder obsessive compulsive disorder generalized anxiety disorder an anxiety disorder
Jesse is diagnosed with obsessive compulsive disorder He acknowledges that he pulls his hair when he feels anxiety He sees his broken hairs when he looks in the mirror His psychologist who prefers habit reversal therapy has asked him to sta counting numbers from 100 in the reverse order whenever he felt an intense urge to act on the impulse to pull out his hair Which of the following comorbid disorders is being treated in this instance O body dysmorphic disorder O low self esteem trichotillomania O generalized anxiety disorder
Anatomy and Physiology
G.I Tract
Jesse is diagnosed with obsessive compulsive disorder He acknowledges that he pulls his hair when he feels anxiety He sees his broken hairs when he looks in the mirror His psychologist who prefers habit reversal therapy has asked him to sta counting numbers from 100 in the reverse order whenever he felt an intense urge to act on the impulse to pull out his hair Which of the following comorbid disorders is being treated in this instance O body dysmorphic disorder O low self esteem trichotillomania O generalized anxiety disorder
Ron has been diagnosed with OCD and is always concerned about his lucky numbers Whenever he looks at dates on a calendar or chooses a day to do a particular activity he is excessively preoccupied with lucky and unlucky numbers From humanistic perspective how would this behavior be explained Ron is attempting to work toward self actualization but finds himself stuck and unable to move forward O Ron has abnormalities in the brain regions that cause OCD symptoms Ron falsely assumes that he should exercise control over his thoughts Ron has an unconscious conflict that he is trying to stop or cope with
Anatomy and Physiology
Head and Neck
Ron has been diagnosed with OCD and is always concerned about his lucky numbers Whenever he looks at dates on a calendar or chooses a day to do a particular activity he is excessively preoccupied with lucky and unlucky numbers From humanistic perspective how would this behavior be explained Ron is attempting to work toward self actualization but finds himself stuck and unable to move forward O Ron has abnormalities in the brain regions that cause OCD symptoms Ron falsely assumes that he should exercise control over his thoughts Ron has an unconscious conflict that he is trying to stop or cope with
Lashon was violently attacked in a dark parking lot after work a week ago Her assaulter took her purse and her car and left her for dead She is constantly re experiencing the event through images dreams thoughts and flashbacks She finds hers avoiding situations that might make her think about the trauma but she is still so anxious that she cannot concentrate or slee Lashon is likely suffering from O agoraphobia O acute stress disorder O obsessive compulsive disorder O post traumatic stress disorder
Anatomy and Physiology
Introduction to Physiology
Lashon was violently attacked in a dark parking lot after work a week ago Her assaulter took her purse and her car and left her for dead She is constantly re experiencing the event through images dreams thoughts and flashbacks She finds hers avoiding situations that might make her think about the trauma but she is still so anxious that she cannot concentrate or slee Lashon is likely suffering from O agoraphobia O acute stress disorder O obsessive compulsive disorder O post traumatic stress disorder
Sound is amplified by components of the middle ear when they vibrate When one of these components the stapes vibrates the will vibrate O pinna O cochlea O oval window eustachian tube O tympanic membrane
Anatomy and Physiology
Introduction to Physiology
Sound is amplified by components of the middle ear when they vibrate When one of these components the stapes vibrates the will vibrate O pinna O cochlea O oval window eustachian tube O tympanic membrane
Convex lenses can correct 1 also called farsightedness
Anatomy and Physiology
Joints
Convex lenses can correct 1 also called farsightedness
The 1 ear is the location of the pinna and auditory canal
Anatomy and Physiology
Circulation
The 1 ear is the location of the pinna and auditory canal
he ear is the location of the pinna and auditory canal
Anatomy and Physiology
Circulation
he ear is the location of the pinna and auditory canal
Nearsightedness and farsightedness are caused by the density of the aqueous and vitreous humor O positioning of the rods and cones O length of the eyeball O shape of the cornea shape of the lens
Anatomy and Physiology
Embryo
Nearsightedness and farsightedness are caused by the density of the aqueous and vitreous humor O positioning of the rods and cones O length of the eyeball O shape of the cornea shape of the lens
Somatic sensations include temperature touch vibration pressure and pain these sensations originate from receptors found in specific localized areas of the body True False
Anatomy and Physiology
Introduction to Physiology
Somatic sensations include temperature touch vibration pressure and pain these sensations originate from receptors found in specific localized areas of the body True False
Which one of the following parts of the eye is continuous with the cornea and forms the outer surface of the back of the eye sclera retina oval window choroid
Anatomy and Physiology
Introduction to Physiology
Which one of the following parts of the eye is continuous with the cornea and forms the outer surface of the back of the eye sclera retina oval window choroid
A student noticed that when he closed his eyes he could still determine the position of his arr and legs This is largely due to the activity of O mechanoreceptors O pain receptors chemoreceptors Merkel disks Meissner s corpuscles
Anatomy and Physiology
Embryo
A student noticed that when he closed his eyes he could still determine the position of his arr and legs This is largely due to the activity of O mechanoreceptors O pain receptors chemoreceptors Merkel disks Meissner s corpuscles