Question

Threads that attach the valve flaps to the ventricle walls are called?

1) Tendons
2) Ligaments
3) Muscles
4) Nerves

Answer 1

The threads connecting the valve flaps to the ventricle walls are called chordae tendineae, which are made of connective tissue and prevent valve inversion during ventricular contractions.

Step-by-step explanation:

The threads that attach the valve flaps to the ventricle walls are called chordae tendineae, which translates to "tendinous cords" or are sometimes referred to as "heart strings." The chordae tendineae are composed of strong strands of connective tissue, made up of approximately 80 percent collagenous fibers, with the remainder consisting of elastic fibers and endothelium.

These important structures connect each of the valve flaps to papillary muscles that extend from the inferior ventricular surface, helping to prevent the valves from inverting during the contraction of the ventricles and thus preventing blood from flowing back into the atria.