Question

Which of the following valves guards the entry of the superior vena cava into the right atrium?

• A. Haversian valve
• B. Eustachian valve
• C. Thebesian valve
• D. Tricuspid valve

Answer 1

The correct option is A Haversian valve

The superior vena cava collects deoxygenated blood from the upper parts of the body (head and arms) and enters into the right atrium through the Haversian valve.
The inferior vena cava collects deoxygenated blood from the lower parts of the body and enters into the right atrium through the Eustachian valve.
The coronary sinuses collect deoxygenated blood from the heart walls and enter the right atrium through the Thebesian valve.
Tricuspid valve is found in between the right atrium and right ventricle and allows unidirectional blood flow.