First slide

Mechanism of Breathing

Question

Which of the following contract during inspiration?
(a) Diaphragm
(b) External intercostal muscles
(c) Internal intercostal muscles
(d) Abdominal muscles

Easy

A

(c) and (d)
B

(b) and (d)
C

(a) and (b)
D

(a) and (c)

Solution

The diaphragm and external intercostal muscles contract during inhalation and relax during normal exhalation. Internal intercostal muscles and abdominal muscles contract during forceful exhalation.

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