The valves controlling the one-way flow of blood from atria to ventricles are:
Correct answer: C. Bicuspid and tricuspid valves
- A. Pulmonary arteries
- B. Sinoatrial valve
- C. Bicuspid and tricuspid valves
- D. Septum
Explanation
The bicuspid and tricuspid valves control the one-way flow of blood from the atria to the ventricles. The bicuspid valve is located between the left atrium and the left ventricle. It has two flaps, or leaflets, that open and close to allow blood to flow in one direction. When the left atrium contracts, it pushes blood against the leaflets of the bicuspid valve. The leaflets open, allowing blood to flow from the left atrium to the left ventricle. When the left ventricle contracts, it pushes against the leaflets of the bicuspid valve. The leaflets close, preventing blood from flowing back into the left atrium.The tricuspid valve is located between the right atrium and the right ventricle. It has three flaps, or leaflets, that open and close to allow blood to flow in one direction. When the right atrium contracts, it pushes blood against the leaflets of the tricuspid valve. The leaflets open, allowing blood to flow from the right atrium to the right ventricle. When the right ventricle contracts, it pushes against the leaflets of the tricuspid valve. The leaflets close, preventing blood from flowing back into the right atrium.
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