Question

Select the correct statements about the heart.

• A. Blood flows at tremendous pressure through the heart, so valves are absent.
• B. Deoxygenated blood flows on the right side and oxygenated blood flows on the left side.
• C. The atrium and the ventricle on the right side contract simultaneously, and the atrium and the ventricle on the left side contract simultaneously.
• D. The two atria contract simultaneously, and the two ventricles contract simultaneously.

Answer 1

Answer: (B), (D)

The correct options are
B

Deoxygenated blood flows on the right side and oxygenated blood flows on the left side.

D

The two atria contract simultaneously, and the two ventricles contract simultaneously.

Deoxygenated blood flows on the right side and oxygenated blood flows on the left side of the heart.

Blood flows into both the atria simultaneously. When the atria are filled, they also contract simultaneously filling their respective ventricles. Once, the ventricles are full, then contract simultaneously, pumping blood into their respective blood vessels.

Valves are present inside the heart to prevent the backflow of blood. This ensures that blood always moves in the desired direction.