Discussion
Every 100 ml of deoxygenated blood delivers approximately __________ ml of \(CO_{2}\) to the alveoli.
Answer: D
The amount is about 4 ml of carbon dioxide.
Deoxygenated (mixed venous) blood carries about 52 ml of carbon dioxide per 100 ml, and arterial blood about 48 ml per 100 ml. As blood passes through the lungs it gives up the difference:
\[ 52 - 48 = 4 \text{ ml per 100 ml of blood} \]
This 4 ml is what physiology texts quote as the carbon dioxide delivered to the alveoli by each 100 ml of blood at rest. The smaller figures of 1, 2 and 3 ml understate this exchange.
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