Question:easy
Normal cerebral blood flow is approximately how many ml/min?
Normal cerebral blood flow is approximately how many ml/min?
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The brain gets about 15 percent of cardiac output; the 55 figure is per 100 g, not total.
Updated On: Jun 24, 2026
- 55
- 150
- 750
- 1000
Show Solution
The Correct Option is C
Solution and Explanation
Step 1: Start from cardiac output, about 5000 ml/min at rest. The brain receives roughly 15 percent of this, giving a cerebral blood flow near 750 ml/min.
Step 2: Cross-check with the per-mass figure: the brain weighs about 1400 g and receives about 50 to 55 ml/100 g/min, so 14 times 54 is close to 750 ml/min. The two estimates agree.
Step 3: The 55 option is a trap because it is the flow per 100 g, while 150 and 1000 do not match either estimate. The whole-brain answer is 750 ml/min.
\[\boxed{750\ ml/min}\]
Step 2: Cross-check with the per-mass figure: the brain weighs about 1400 g and receives about 50 to 55 ml/100 g/min, so 14 times 54 is close to 750 ml/min. The two estimates agree.
Step 3: The 55 option is a trap because it is the flow per 100 g, while 150 and 1000 do not match either estimate. The whole-brain answer is 750 ml/min.
\[\boxed{750\ ml/min}\]
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