Question

(b) Why does the heart need valves?​

Answer 1

Answer​:

​ The heart needs valves to prevent or stop the backward flow of blood (from ventricles to atrium).​ The left atrium is connected to the left ventricle through a valve V1 (bicuspid valve).​ Similarly, the right atrium is connected to the right ventricle through another valve V2 (tricuspid).​ When the ventricles contract, the valves V1 and V2 close automatically so that the blood may not go back into the atria.​ ​ ​