Question

Chordae tendineae
A. Increases area of ventricle
B. Prevent pushing of auriculoventricular valve into auricle
C. Keeps auricles stretched
D. Direct flow of blood into truncus arteriosus

Answer 1

Hint: Chordae tendineae are strings or chords. We all know that the strings or chords remain stretched and usually their function is to keep the other parts stretched and in position. Same is the function performed by the chordae tendineae in the heart.

Complete answer:
To know the correct answer to the question, we must be well aware of the anatomy of the heart.
 The heart is covered by pericardium. It is divided into 4 chambers: 2 auricles and 2 ventricles.
The chordae tendinae are strong cord-like structures which are located inside the human heart. These are the fibrous cords which are attached to the flaps of both the valves (bicuspid and tricuspid). The other end of these chordae tendineae is attached to the ventricular walls using papillary muscles. The auricles of the heart contract and pour their blood into the ventricles. During the ventricular contraction, when the blood is being poured into the aorta and the pulmonary artery, the chordae tendineae prevents the collapsing of the valves back into the auricles.

Therefore, the correct answer to the question is option B, i.e.The chordae tendineae prevents the pushing of the auriculoventricular valve into auricle.

Note: Here it must be noted that the chordae tendineae also prevents the ventricles from collapsing. During the complete cardiac cycle, for a very short period of time, the ventricles remain empty. The chance of their collapsing is the maximum. Chordae tendineae prevents this collapsing by keeping it stretched.