b d Identify the muscle labeled g e g h Identify the muscle

What is one reason arteries can withstand higher blood pressure than veins Arteries contain only oxygenated blood Arteries have thick walls that contain layers of muscle and connective tissue Arteries contain all types of blood cells whereas veins contain only erythrocytes Arteries have one way valves to prevent blood from flowing bacloud PL

Figure 39 1 Which area in Figure 39 1 indicates a complete sarcomere 3 2 4 5

The plasma membrane of muscle cells help maintain a concentration gradient of calcium ions Ca2 between muscle cell s cytoplasm and extracellular fluid When a muscle cell receives a signal to contract Ca2 moves down this concentration gradient passing from the extracellular space into the cytoplasm of the cell Which of the following is the most likely mechanism by which Ca2 move across the plasma membrane during muscle cell contraction

The diagram shows the side view of the human elbow Which structure is the radius A A B C 2 The electron micrograph shows sarcomeres in myofibrils of striated muscle during muscle contraction T lines P Q and R S show two regions of one sarcomere C D D How would regions P Q and R S change when the muscle relaxes WasaKENDOS P Q wider B narrower wider no chango R S narrower wider One sarcomere no change P Q RS Name A alenn

The type of stress at a convergent boundary is at a divergent boundary is and at a transform boundary is A Tension Compression Shear B Shear Compression Tension C Tension Shear Compression D Compression Tension Shear E Compression Shear Tension

Complete the following paragraph 1 Skeletal muscles are composed of many individual cells or Click to select Click to select 2 The motor neuron and all the myofibers it innervates is referred to as a Click to select sends a nerve impulse to a skeletal muscle fiber the muscle fiber will Click to select 3 The number of motor units activated determines how much Click to select number of motor units activated the Click to select Click to select sensory neuron more motor neuron be stimulated to contract muscle fibers motor unit force greater the force lesser the force relax 4 Each muscle fiber is innervated by a Every time a motor neuron is generated by the muscle The greater the Therefore lifting a heavy object would require motor units than lifting a light object would require

To make a muscle contract more strongly the nervous system can activate more motor units This process is cal Multiple Choice summation twitch motor unit recruitment incomplete tetanus

While the presence of calcium ions inside the sarcoplasm is necessary for contraction it is not sufficient Once calcium has been released and enables actin myosin crossbridges to form is needed for the muscle contraction Multiple Choice ATP another action potential acetylcholine sodium

Which of the following is are needed for skeletal muscle contraction check all that apply Check All That Apply ATP hydrogen calcium water

In an electromyography EMG read out all motor units can look slightly different because Select all that apply Check All That Apply every muscle has a varying number of motor units so they can generate different frequencies each motor unit can generate a different amount of recruitment every muscle has one motor unit so they have slightly different frequencies each motor unit can innervate a different number of muscle fibers