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  • Which of the following statement(s) is (are) true about respiration? (i) During inhalation, ribs move inward and diaphragm is raised

Which of the following statement(s) is (are) true about respiration?
(i) During inhalation, ribs move inward and diaphragm is raised
(ii) In the alveoli, exchange of gases takes place i.e., oxygen from alveolar air diffuses into blood and carbon dioxide from blood into alveolar air
(iii) Haemoglobin has greater affinity for carbon dioxide than oxygen
(iv) Alveoli increase surface area for exchange of gases
(a) (i) and (iv) (b) (ii) and (iii)
(c) (i) and (iii) (d) (ii) and (iv)

Answers (1)

Ans. (d)
During inhalation, diaphragm pulls downward which induces the lower ribs to move upward and forward. Hence the given statement is false. The alveoli are the place where the lungs and the blood trade oxygen and carbon dioxide during the way toward breathing in and breathing out. In the alveoli, exchange of gases takes place i.e., oxygen from alveolar air diffuses into blood and carbon dioxide from blood into alveolar air. This statement is true.

Oxygen ties to the iron particles in the haemoglobin while carbon dioxide CO_{2} is bound to the haemoglobin chains of the structure. Hence haemoglobin has greater affinity for oxygen than carbon dioxide. Hence the given statement is false. Many alveoli are present in the lungs with a shape that further increases surface area for exchange of gases. This statement is true.

Hence option (d) is correct.

 

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