The function of chordae tendineae is:
a) to contract when the ventricles contract
b) to hold the right and left ventricles together
c) to hold the av valves open during diastole
d) to transmit the electrical impulse from the atria to the ventricles
e) to keep the av valves from everting during ventricular contraction

The correct answer will be option-E.

Explanation:

Chordae tendinae are the string-like structure in the heart which is composed of dense regular connective tissue called collagen and elastin proteins. They arise from the papillary muscles of the heart and branches out in the ventricle portion of the heart.

These play an important role in the closure of the AV valves to prevent the backward flow of the blood to the atria during ventricular contraction by holding cusps of the valve into the dome-shaped structure.

Thus, option-E is the correct answer.

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.