Normal resting coronary artery blood flow is approximately how many milliliters per 100 grams of tissue per minute?

Normal resting coronary artery blood flow is approximately how many milliliters per 100 grams of tissue per minute?

• A. 10 mL/100 g/min
• B. 40 mL/100 g/min
• C. 75 mL/100 g/min
• D. 120 mL/100 g/min

Answer: (C)

Normal resting coronary blood flow reflects how much blood the heart muscle needs at rest to meet its metabolic demands, expressed as mL per 100 g of tissue per minute. At rest, the whole heart receives roughly 225–250 mL of coronary blood flow per minute. The myocardium weighs about 300 g (roughly 3 x 100 g). Dividing the total flow by the mass gives about 75–80 mL per 100 g of tissue per minute. This is why a value around 75 mL/100 g/min is considered normal at rest. The heart can increase this flow substantially with activity to match a much higher oxygen demand.

Normal resting coronary blood flow reflects how much blood the heart muscle needs at rest to meet its metabolic demands, expressed as mL per 100 g of tissue per minute. At rest, the whole heart receives roughly 225–250 mL of coronary blood flow per minute. The myocardium weighs about 300 g (roughly 3 x 100 g). Dividing the total flow by the mass gives about 75–80 mL per 100 g of tissue per minute. This is why a value around 75 mL/100 g/min is considered normal at rest. The heart can increase this flow substantially with activity to match a much higher oxygen demand.