Question

Describe the role of the diaphragm in ventilation and explain how air moves into the lungs on inspiration and out of the lungs on exhalation.

A) The diaphragm pushes air out of the lungs during inspiration, and air is drawn into the lungs during exhalation.
B) The diaphragm relaxes during inspiration, causing the chest to expand and draw air into the lungs. During exhalation, the diaphragm contracts, pushing air out of the lungs.
C) The diaphragm has no role in ventilation, and air enters and exits the lungs passively.
D) The diaphragm contracts during both inspiration and exhalation, pushing air in and out of the lungs.

Answer 1

The diaphragm contracts and flattens during inspiration to draw air into the lungs and relaxes during exhalation to push air out, playing a crucial role in the process of ventilation.

Step-by-step explanation:

The role of the diaphragm in ventilation is crucial for the process of breathing, which includes both inspiration (inhalation) and expiration (exhalation). During inspiration, the diaphragm contracts and flattens down, increasing the space in the thoracic cavity and creating a negative pressure that draws air into the lungs. On the other hand, during exhalation, the diaphragm relaxes, rising into a dome shape, and decreases the space in the thoracic cavity, which causes the air to be pushed out of the lungs