____________ is a dome-shaped structure that aids in breathing.

Trachea

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Rib cage

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Diaphragm

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Pharynx

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Solution

The correct option is C Diaphragm

Diaphragm is a dome-shaped muscular structure present below the chest cavity.

During inhalation, the diaphragm moves down thereby increasing the volume of the chest cavity and air rushes into the lungs.

During exhalation, the diaphragm moves up resulting in the reduction of chest cavity volume and the air is pushed out of the lungs.

Although the diaphragm is not a part of respiratory system, but it facilitates the breathing process.

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