Past Papers · SAQ

Cardiac Cycle — Ventricular AP

Current · V5 (2025) → D2.ii Historical · V4 (2023) → G2.iii 1 exam appearance

2010B Q23

Exam question

Describe the ionic events associated with a ventricular cardiac action potential (80% of marks). Outline how the action potential relates with the mechanical events of the cardiac cycle (20 % marks).

CICMWrecks answer

Master answer

Normal Values:

  • AP Duration 200-250ms
  • ARP 200ms
  • RRP 50ms

RMP -90
Established and maintained by:

  • Na/K-Atpase
  • Na/Ca antiporter
  • Ca ATPase

Threshold potential -65mv

Ventricular action potential and principal ionic conductances
CICMWrecks original diagram
Diagram used in Cardiac Cycle — Master Answer
Legacy CICMWrecks figure · Source verification pending.
Diagram used in Cardiac Cycle — Master Answer
Legacy CICMWrecks figure · Source verification pending.

<To be updated>

Gladwin 2016

Answer by Gladwin

Past papers

Exam appearances

1 appearance
Exam Exact exam wording Candidate success
2010B Q23 Describe the ionic events associated with a ventricular cardiac action potential (80% of marks). Outline how the action potential relates with the mechanical events of the cardiac cycle (20 % marks). 27%