Biology Breathing and Exchange of Gases Mechanism of Breathing and Pulmonary Volumes Single Correct MCQ
Published on: August 13, 2026

Fill up the blanks in the following paragraph by selecting the correct option.
The movement of air into and out of the lungs is carried out by creating a (i) between the lungs and the atmosphere. Inspiration can occur if intra-pulmonary pressure is (ii) than the atmospheric pressure. Expiration takes place when the intra-pulmonary pressure is (iii) than the atmospheric pressure. Inspiration is initiated by (iv) the of diaphragm which (v) the volume of thoracic chamber in the antero-posterior axis.

(i)

(ii)

(iii)

(iv)

(v)

(a)

concentration

gradient

concentration

gradient

less

higher

relaxation

increases

concentration

gradient

(b)

concentration

gradient

concentration

gradient

higher

less

contraction

decrease

concentration

gradient

(c)

pressure

gradient

pressure

gradient

higher

less

relaxation

decrease

pressure

gradient

(d)

pressure

gradient

pressure

gradient

less

higher

contraction

increases

pressure

gradient

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