Question

Question 18
What prevents backflow of blood inside the heart during contraction?

(a) Valves in heart
(b) Thick muscular walls of ventricles
(c) Thin walls of atria
(d) All of the above

Answer 1

(a) Valves in heart

Valves ensure that blood does not flow back when the atria or ventricles contract. Since ventricles have to pump blood into various organs with high pressure, they have thicker walls than atria. The separation of the right side and left side of the heart by the ventricular septum. This helps to keep oxygenated and deoxygenated blood from mixing so as to supply a high amount of oxygen to the body as the oxygen demand in multicellular organisms is enormous.