Question

Which one of the following statements is correct?

• A. The atrioventricular node (AVN) generates an action potential to stimulate atrial contraction
• B. The tricuspid and the bicuspid valves open due to the pressure exerted by the simultaneous contraction of the atria
• C. Blood moves freely from atrium to the ventricle during joint diastole
• D. Increased ventricular pressure causes closing of the semilunar valves

Answer 1

The Correct Option is C

The correct statement from the given options is: "Blood moves freely from atrium to the ventricle during joint diastole."

The process works as follows:

1. Joint Diastole: During this phase, both atria and ventricles are in a relaxed state, leading to the opening of the atrioventricular valves (the tricuspid and bicuspid/mitral valves).
2. Blood Flow: As a result of the lower pressure in the ventricles compared to the atria, blood flows passively from the atria into the ventricles.
3. Role of Semilunar Valves: During joint diastole, the semilunar valves (located between the ventricles and the arteries) remain closed to prevent the backflow of blood from the arteries into the ventricles.

This statement accurately reflects the physiological process during the cardiac cycle.