Baroreceptor Speed Haemorrhage — FRCA Primary MCQ
Instant feedback + full explanation. One question, done properly.
Educational content. Not a substitute for clinical judgement or local policy.
Reveal the answer and explanation
Correct answer: A — Seconds
The baroreceptor reflex activates within seconds: decreased arterial pressure reduces firing leading to increased sympathetic outflow causing tachycardia and vasoconstriction. RAAS takes minutes to hours. Fluid shifts occur over hours. Erythropoietin responses take days.
Reference: Power Kam 2018 Principles of Physiology for the Anaesthetist