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