During inhalation, ____.
A)thoracic volume decreases
B)the diaphragm contracts by flattening
C)pressure in your alveoli rises
D)the ribs are moved downward
E)atmospheric pressure falls

Question

During inhalation, ____. ​
A)thoracic volume decreases
B)the diaphragm contracts by flattening
C)pressure in your alveoli rises
D)the ribs are moved downward
E)atmospheric pressure falls ​

Quizplus · Accepted Answer

During inhalation, the diaphragm contracts and flattens, causing the volume of the thoracic cavity to increase. This increase in volume lowers the pressure in the lungs, causing air to rush in from the atmosphere. The ribs also move upward and outward to further increase the volume of the thoracic cavity. Pressure in the alveoli actually decreases during inhalation. Therefore, the correct answer is B.

During Inhalation, ____. ​

During Inhalation, ____.