Question

If the volume in the thoracic cavity increases, the pressure will _____________ and air will move _______.

Select one:

a. decrease/ in

b. increase/ in

c. increase/ out

d. remain unchanged/ remain unchanged

e. decrease/ out

Answer 1

Option (a) is correct option because our respiratory system obeys boyles law, it states that when the volume of the thorasic cavity increases air moves inside the chest and the pressure is decreased due to the inhalation of air.This is how we regulate our breathing mechanism.

Option ( b) is wrong option because pressure is decreased as thorasic cavity volume is increased but not increased.

Option (c) is wrong option because pressure is decreased and the air enters inside.

Option (d) is also wrong option because if it is remained unchanged then there will be problem related to chest cavity.So the pressure should be decreased when air enters.

Option (e) is also wrong option as the pressure decreases when air enters.