Explain the effect of holding your breath or hyperventilation on alveolar and blood PO2 and PCO2.

What will be an ideal response?


Answer: Holding your breath will cause oxygen to be depleted from the lung and carbon dioxide to accumulate. The PO2 in the alveoli and arteries will decline, while the PCO2 will rise. Hyperventilation has the opposite effect. PO2 will rise in the alveoli and arteries, while PCO2 will fall.

Anatomy & Physiology

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