Brain Percentage CO — FRCA Primary MCQ
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Correct answer: C — 15%
The brain receives approximately 15% of CO (~750 mL/min or 50 mL/100g/min). Despite being only ~2% of body weight it consumes ~20% of total body oxygen. It has virtually no oxygen stores making it highly vulnerable to ischaemia.
Reference: Power Kam 2018 Principles of Physiology for the Anaesthetist