When the diaphragm and external intercostal muscles relax:

a. The pressure inside the lungs (intrapulmonary/alveolar pressure) increases. This is because the volume of the lungs decreases, and according to Boyle's law, pressure is inversely proportional to volume.

b. Expiration occurs, not inspiration. When these muscles relax, the volume of the thoracic cavity decreases, forcing air out of the lungs.

c. The volume of the chest cavity decreases. The diaphragm and external intercostal muscles are responsible for expanding and contracting the chest cavity. When they relax, the chest cavity contracts, reducing its volume.

d. The pressure inside the lungs (intrapulmonary/alveolar pressure) does change. It increases due to the decrease in lung volume.

e. The volume of the lungs does change. It decreases as the diaphragm and external intercostal muscles relax.

Question

When the diaphragm and external intercostal muscles relax:

a. The pressure inside the lungs (intrapulmonary/alveolar pressure) increases. This is because the volume of the lungs decreases, and according to Boyle's law, pressure is inversely proportional to volume.

b. Expiration occurs, not inspiration. When these muscles relax, the volume of the thoracic cavity decreases, forcing air out of the lungs.

c. The volume of the chest cavity decreases. The diaphragm and external intercostal muscles are responsible for expanding and contracting the chest cavity. When they relax, the chest cavity contracts, reducing its volume.

d. The pressure inside the lungs (intrapulmonary/alveolar pressure) does change. It increases due to the decrease in lung volume.

e. The volume of the lungs does change. It decreases as the diaphragm and external intercostal muscles relax.

Knowee AI · Accepted Answer

When the diaphragm and external intercostal muscles relax:

a. The pressure inside the lungs (intrapulmonary/alveolar pressure) increases. This is because the volume of the lungs decreases, and according to Boyle's law, pressure is inversely proportional to volume.

b. Expiration occurs, not inspiration. When these muscles relax, the volume of the thoracic cavity decreases, forcing air out of the lungs.

c. The volume of the chest cavity decreases. The diaphragm and external intercostal muscles are responsible for expanding and contracting the chest cavity. When they relax, the chest cavity contracts, reducing its volume.

d. The pressure inside the lungs (intrapulmonary/alveolar pressure) does change. It increases due to the decrease in lung volume.

e. The volume of the lungs does change. It decreases as the diaphragm and external intercostal muscles relax.

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