Question

4. Contraction of the intercostal muscles and diaphragm cause the thoracic cavity to
and the air pressure in the lungs to
[ ]
A) expand; decrease
B) expand; increase
C) contract; increase
D) contract; decrease​

Answer 1

Explanation:

The correct option is A because when Contraction of intercostal muscles and diaphragm takes place the thoracic cavity expands because the pressure of lungs before inspiration is equal to the presure of 1 atm. During Inspiration, The volume of lungs increase the pressure in the lungs decreases.

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