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Multiple Choice

Oxygen delivery DO2 unit is which of the following?

Oxygen delivery (DO2) is the rate at which oxygen is delivered to body tissues. It depends on how much blood is being pumped (cardiac output) and how much oxygen each unit of blood can carry (arterial O2 content). The practical way to express DO2 is in milliliters of O2 per minute, because you’re counting how many milliliters pass to the tissues every minute. DO2 is calculated as CO times CaO2, where CO is typically in liters per minute and CaO2 is in milliliters of O2 per 100 milliliters of blood. When you multiply these, you get a rate in milliliters of O2 per minute. For example, with a cardiac output of 5 L/min and an arterial O2 content around 20 mL O2 per 100 mL blood, DO2 ≈ 1000 mL O2/min. The other units (L/min, L/s, mL/L) don’t correctly represent the delivery rate of O2 per minute.

Oxygen delivery (DO2) is the rate at which oxygen is delivered to body tissues. It depends on how much blood is being pumped (cardiac output) and how much oxygen each unit of blood can carry (arterial O2 content). The practical way to express DO2 is in milliliters of O2 per minute, because you’re counting how many milliliters pass to the tissues every minute. DO2 is calculated as CO times CaO2, where CO is typically in liters per minute and CaO2 is in milliliters of O2 per 100 milliliters of blood. When you multiply these, you get a rate in milliliters of O2 per minute. For example, with a cardiac output of 5 L/min and an arterial O2 content around 20 mL O2 per 100 mL blood, DO2 ≈ 1000 mL O2/min. The other units (L/min, L/s, mL/L) don’t correctly represent the delivery rate of O2 per minute.