Neurophysiology, Endocrine, Metabolism and Temperature
CNS physiology, cerebral circulation, neuromuscular physiology, endocrine control, metabolism and thermoregulation.
How to prepare for the current Primary FRCA MCQ
Build mechanisms first, practise calculations with units, connect equipment to failure modes and finish every SBA by choosing the single best answer to the exact lead-in.
Core concepts
Concept 1
Neuronal signalling, cerebral blood flow, intracranial volume and nociceptive pathways connect nervous-system science to anaesthesia.
Exam cue: Separate cerebral blood flow, cerebral perfusion pressure and intracranial pressure.
Concept 2
Endocrine feedback, substrate use, stress response and heat balance explain common perioperative metabolic disturbance.
Exam cue: Locate an endocrine disorder using the direction of upstream and end-organ hormone change.
Risk pitfalls and guardrails
Assuming all sedative endpoints represent the same neural process.
Guardrail: Do not choose an option merely because it states a true fact; choose the one that best answers the exact lead-in under the stated conditions.
Attributing early post-induction hypothermia only to environmental heat loss.
Guardrail: Do not choose an option merely because it states a true fact; choose the one that best answers the exact lead-in under the stated conditions.
Memory anchors
What is cerebral perfusion pressure commonly approximated by?
Mean arterial pressure minus intracranial pressure, interpreted with the relevant downstream pressure.
What is the Monro–Kellie principle?
Brain, blood and cerebrospinal-fluid volumes share a constrained total within the rigid skull.
How does carbon dioxide affect cerebral flow?
Within the physiological range, higher arterial carbon dioxide dilates cerebral vessels and lower carbon dioxide constricts them.
How does negative endocrine feedback help localisation?
Paired controller and end-organ hormone results reveal whether the primary disturbance is upstream or at the target organ.
Why does core temperature fall early after induction?
Anaesthetic vasodilation redistributes heat from core to peripheral tissues before ongoing environmental loss dominates.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Cerebral blood flow is most sensitive to acute changes in which arterial gas?
Acute hypocapnia has what effect on cerebral blood flow?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
What is Pass Harbor?
Completely free exam prep for 247 UK exams.
- Practice questions
- Flashcards
- Study guides
- Mock exams
- No registration
- No paywall
- Start instantly
“No more expensive exam prep. Quality study tools should be accessible to everyone.”