The movement of air in and out of lungs is called __.

Ventilation

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respiration

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transpiration

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None of the above.

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Solution

The correct option is A Ventilation
The movement of air in and out of lungs is called breathing. Breathing has two components: inhalation and exhalation. Inhalation is the process of taking the air inside the lungs. Exhalation is giving the air out of lungs. So breathing is both inhalation and exhalation.

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