The movement of air in and out of lungs is called _________

Ventilation

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Respiration

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Circulation

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Excretion

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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 in taking the air inside the lungs. Exhalation is giving the air out of the lungs. So breathing is both inhalation and exhalation.

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Explain why, when air is taken in and let out during breathing, the lungs always contain a residual volume of air.

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