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

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(b) and (d)

(a) and (b)

(a) and (c)

answer is C.

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Detailed 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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