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:A
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
Explanation: Walls in the heart are responsible for only pumping of the blood and they are not responsible in blocking backflow of blood inside the heart during contraction.