Home Biology Breathing and Exchange of Gases Skill Builder Arrange the following events in the correct …
Biology Breathing and Exchange of Gases Skill Builder Single Correct MCQ
Published on: August 13, 2026

Arrange the following events in the correct sequence as they occur during the inspiration phase of breathing:

A
Increase in pulmonary volume
, (E), , , (E), ,
B
Contraction of diaphragm and external inter-costal muscles
, , (E), , ,
C
Air moves into the lungs
D
Increase in thoracic volume
(E) Decrease in intra-pulmonary pressure Options: , , , (E), ,

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During the inspiration phase, the process begins with the contraction of the diaphragm and external inter-costal muscles , leading to an increase in thoracic volume . This increase in volume then causes an increase in pulmonary volume . As the pulmonary volume increases, intra-pulmonary pressure decreases (E), allowing air to move into the lungs .

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