A) Due to contraction of external inter costal muscles and flattening of diaphragm the volume of thoracic cavity decreases
B) The abdominal muscles contract
C) Due to contraction of external inter costal muscles and flattening of diaphragm the volume of thoracic cavity increases
D) The internal intercostal muscles relax
Correct Answer: A
Solution :
Inspiration is a process by which fresh air enters the lungs, due to contraction of external intercostal muscles and flattening of diaphragm.
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