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Question

State one function of each of the following:
Intercostal muscles

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Solution

The intercostal muscles contract and relax to change the size of the thoracic cavity by pulling the rib cage inwards and outwards. This allows inhalation and exhalation.

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Mark the correct pair of muscles involved in normal breathing in humans.

(a) External and internal intercostal muscles

(b) Diaphragm and abdominal muscles

(c) Diaphragm and external intercostal muscles

(d) Diaphragm and intercostal muscles

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Q. The external intercostal muscles relax during inspiration.

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