The plateau phase of the ventricular action potential, which prolongs contraction, is sustained mainly by the inflow of which ion?

Practise this EKG Technician question free, then download the PDF, watch the video walkthrough, or unlock timed mock exams for the full web bank.

Download PDF Watch video

Multiple choice — select the best answer

ASodium
BCalcium
CPotassium
DBicarbonate

✓ Correct answer: B. Calcium Slow inward calcium current balances potassium efflux to create the plateau, prolonging the action potential and supporting myocardial contraction.

.q-expl{display:block!important}.q-opt[data-idx="1"]{border-color:#16a34a;background:#f0fdf4}.q-opt[data-idx="1"] .oltr{background:#16a34a;color:#fff}.q-opt{cursor:default!important;pointer-events:none}

Keep practising. Use the free EKG Technician PDF, watch the YouTube walkthrough, or unlock all 10 web questions with timed mock exams.

Free PDF Video walkthrough

Topic: Cardiac Anatomy & Electrophysiology

← Previous Next → 🎲 Random question ↩ Back to all questions

Keep practising

The plateau phase of the ventricular action potential, which prolongs contraction, is sustained mainly by the inflow of which ion?

Related questions — Cardiac Anatomy & Electrophysiology

Free practice here. Timed mocks when you are ready.