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Which of the following muscles involve in forceful expiration?

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External and internal intercostal muscles

Abdominal muscles and internal intercostal muscles

Abdominal muscles and diaphragm muscles

Diaphragm muscles and external intercostal muscles

answer is C.

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Detailed Solution

The strength of inspiration and expiration can be increased with the help of additional muscles in the abdomen and internal intercostal muscles.

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