How much blood flows through your brain?
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1 litre every second
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1 litre every minute
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1 litre every 10 minutes
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1 liter ever millisecond
About 1 liter of blood flows through the brain per minute (around 750 ml/min, but 1 liter is the closest option). The brain receives about 15-20% of the heart's output despite being only 2% of body weight. Option A (per second) would be 60 liters/minute - impossibly high. Option D (per millisecond) is absurdly impossible.
Standard human physiology puts total cerebral blood flow at roughly 750 mL per minute in an average adult (about 15% of resting cardiac output, i.e., close to but a bit under 1 liter per minute) — this is the figure given in physiology and neurology references (Springer, ScienceDirect, PubMed, radiology/anesthesia texts). At the tissue level this equates to roughly 50-60 mL of blood per 100g of brain tissue per minute. The DB's marked answer, '1 litre every 10 minutes,' understates true cerebral blood flow by roughly an order of magnitude and is not supported by any physiological source. Of the four options, '1 litre every minute' is the closest match to the well-established ~750 mL/min figure and is the one commonly cited in popular-science summaries of brain blood flow.