Chest cavity is enlarged by action of _______.

Heart

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Diaphragm

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Lungs

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All of the above

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Solution

The correct option is B Diaphragm
The diaphragm is a large muscular sheet that forms the floor of the chest cavity. Its movement is crucial for breathing. When it moves downward during inhalation, the volume of the chest cavity increases whereas its upward movement helps in expelling the air out of the lungs.
Hence the correct option is B.

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The floor of the chest cavity has a thick muscular partition known as the diaphragm.

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