Question

Which of the following events take place during inhalation?

• A. The volume of chest cavity increases, pressure in lungs increases.
• B. The volume of chest cavity increases, pressure in lungs decreases.
• C. Diaphragm moves down.
• D. Diaphragm moves up.

Answer 1

Answer: (A), (C)

Diaphragm moves down.

During inhalation, the diaphragm moves downward causing the chest cavity to increase in size. The same amount of air now occupies a larger space, causing the pressure inside the lungs to decrease. This results in the air rushing in through the nostrils into the lungs.