What is the typical resting myocardial oxygen consumption in mL per 100 g of tissue per minute?

What is the typical resting myocardial oxygen consumption in mL per 100 g of tissue per minute?

• A. 2.0
• B. 3.5
• C. 10
• D. 15

Answer: (C)

At rest, the heart’s oxygen demand is relatively modest but still substantial, and the myocardium extracts a large fraction of the oxygen carried in blood. The typical resting myocardial oxygen consumption is about 8–10 mL of O2 per 100 g of tissue per minute, with 10 mL/100 g/min being a close, commonly cited value. This reflects that even at rest the heart uses a steady amount of O2 to support its ongoing work. So the best answer is the value around 10. The lower numbers would underrepresent resting needs, while the higher number would reflect increased demand during exercise or stress.

At rest, the heart’s oxygen demand is relatively modest but still substantial, and the myocardium extracts a large fraction of the oxygen carried in blood. The typical resting myocardial oxygen consumption is about 8–10 mL of O2 per 100 g of tissue per minute, with 10 mL/100 g/min being a close, commonly cited value. This reflects that even at rest the heart uses a steady amount of O2 to support its ongoing work.

So the best answer is the value around 10. The lower numbers would underrepresent resting needs, while the higher number would reflect increased demand during exercise or stress.