Which one of the following statements is correct ?

1. Increased ventricular pressure causes closing of the semilunar valves.

2. The atrio-ventricular node (AVN) generates an action potential to stimulate atrial contraction

3. The tricuspid and the bicuspid valves open due to the pressure exerted by the simultaneous contraction of the atria

4. Blood moves freely from atrium to the ventricle during joint diastole.

Doubtly Asked 30 Oct 2026 NEET UG 2022 Practice test neet Save WhatsApp Report

1 answer

Best answer

Answer: 4. Blood moves freely from atrium to the ventricle during joint diastole.

Key idea: During joint diastole, both atria and ventricles relax and blood flows freely from atria to ventricles.

Option 1: rising ventricular pressure opens the semilunar valves. Wrong.
Option 2: the SAN, not AVN, starts the action potential for atrial contraction. Wrong.
Option 3: AV valves open when ventricular pressure falls below atrial pressure, not due to atrial contraction alone. Wrong as worded.
Option 4: correct.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

Was this answer helpful?