Which of the following increases area of thoracic cavity during inhalation?
A
Outward and upward movement of rib-cage
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B
Outward and downward movement of rib-cage
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C
Inward and downward movement of rib-cage
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D
Inward and upward movement of rib-cage
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Solution
The correct option is A Outward and upward movement of rib-cage During inhalation, the rib cage expands. As a result, the air pressure decreases and air enter the lungs. The rib muscle and the diaphragm contracts. Hence during inhalation the area of thoracic cavity increases to pull your rib cage both upward and outward. Thus the correct answer is option A.