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Breathing Rate and Ventilation Rate

The breathing rate and tidal volume depend on the activity of a person.The breathing rate is the number of breaths taken per minute.The ventilation rate is the total volume of air inhaled in one minute.When the demand for oxygen is high, the breathing rate increases and the lungs take in more oxygen.The tidal volume can increase to up to 50% of the vital capacity.

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Specification: OCR Biology A (H020), AS-level, 3.1.1 Exchange surfaces. Topic: Exchange Surfaces and Breathing.

Key terms in this lesson

ventilation
The movement of air into and out of the lungs, which maintains a diffusion gradient across the gas exchange surface.
tidal volume
The volume of air taken into or out of the lungs during one resting breath.

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