Science
Which of the following statements are correct in reference to the role of A (shown in the given diagram) during a breathing cycle in human beings?
(i) It helps to decrease the residual volume of the air in lungs.
(ii) It flattens as we inhale.
(iii) It gets raised as we inhale.
(iv) It helps the chest cavity to become larger.
- (ii) and (iv)
- (iii) and (iv)
- (i) and (ii)
- (i), (ii) and (iv)
Respiratory System
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Answer
(ii) and (iv)
Reason — While breathing in, we lift our ribs and flatten our diaphragm, and the chest cavity becomes larger. Because of this, air is sucked into the lungs and fills the expanded alveoli.
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