Question

Which of the following statements is TRUE?
I. Contraction of the papillary muscles creates tension in the chordae tendinae
II. The mitral valve is the only valve with chordae tendinae
III. The AV valves are closed during atrial systole

Answer 1

Answer :
Option I. - Contraction of the papillary muscles creates tension in the chordae tendinae

When the papillary muscles contract, there is tension created in the chordae tendinae. This prevents the occurrence of potential backflow of blood. It prevents the regurgitation of blood back into the atria during ventricular contraction.

Both the  atrioventricular valves have chordae tendinae - the mitral valve (bicuspid valve) and the tricuspid valves.

The Atrioventricular valves (AV valves) are open during the atrial systole which is also known as the last rapid filling phase.