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Which one of the following changes takes place during inspiration?

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in Biology – Class 11 by (272k points)
Which one of the following changes takes place during inspiration?

(a) Decrease in thoracic cavity

(b) Relaxation in diaphragm

(c) Relaxation in external intercostal muscles

(d) Sternum moves towards ventral and anterior direction

The question was asked in unit test.

This interesting question is from Mechanism of Breathing-1 topic in portion Breathing and Exchange of Gases of Biology – Class 11

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Right choice is (d) Sternum moves towards ventral and anterior direction

Best explanation: During inspiration, thoracic volume increases. Sternum moves towards ventral and anterior direction, diaphragm contracts, ribs move towards outside and ventral side.

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