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Question

Ribs moves out during

A
Inhalation
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B
Exhalation
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C
Coughing
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D
Both A and B
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Solution

The correct option is C Inhalation
During inhalation, the ribs move out. This is because the external intercostal muscles are present between ribs. The contraction of these muscles lifts ribs and sternum up and outward causing an increase in the volume of the thoracic cavity in the backwards-forward direction.
So the correct answer is 'Inhalation'.

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