During expiration, which best describes the role of the diaphragm? a) the diaphr

Question

During expiration, which best describes the role of the diaphragm?

a) the diaphragm moves into the thoracic cavity and generates a positive pressure in the thorax relative to the atmosphere

b) the diaphragm changes its electrical charge and it becomes positive

c) the diaphragm moves up and down causing rapid swings in pressure in the thoracic cavity

d) the diaphragm plays a marginal role dealing with ventilation. Its major function is to promote cellular respiration

e) the diaphragm moves into the abdominal cavity and it generates a negative pressure in the thorax relative to the atmosphere

Explanation / Answer

A

Diaphragm relax volume of thoric cavity decreases while pressure increases within it

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