Which of the following is true about the breathing process?

Last updated: 7/9/2022

Which of the following is true about the breathing process? For air to enter into the lungs, the atmospheric pressure must be equal to intrapulmonary pressure The pleural fluid allows the lungs to expand without friction in the thoracic cavity As lung volume increases, intrapulmonary pressure increases The scalene and sternocleidomastoid muscles are primary respiratory muscles