During which of the following process the diaphragm moves down?

Inspiration

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Expiration

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Coughing

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None of the above

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Solution

The correct option is B Inspiration
During inspiration, the diaphragm moves down. The contraction of muscle fibers of the diaphragm causes it to become flat and lowered down thereby increasing the volume of the thoracic cavity in anteroposterior axis, in rabbit or lengthwise in man.
So the correct answer is 'Inspiration'

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During expiration, the diaphragm moves

During inhalation, the diaphragm moves _______ .

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