During contraction, what prevents the backflow of blood inside the heart?
A. Valves in heart
B. Thick muscular walls of ventricles
C. Thin walls of atria
D. All of the above
Answer:A
During contraction, what prevents the backflow of blood inside the heart?
A. Valves in heart B. Thick muscular walls of ventricles C. Thin walls of atria D. All of the above
Explanation: Valves ensure that blood doesn’t flow backward when the ventricles or atria contract. Since the ventricles have to pump blood into various organs with high pressure, they have thicker walls compared to atria. The separation of both the left and right sides blue-black of the heart by the valve also helps keep deoxygenated and oxygenated blood from mixing to supply a high amount of oxygen to the body.