Question

In mammals, the opening of post caval in the right auricle is guarded by

• A. Mitral valve
• B. Thebesius valve
• C. Eustachius valve
• D. Bicuspid valve

Answer 1

Answer: (C)

Eustachius valve

A. Mitral valve is known as bicuspid valve. It is present between left atrium and left ventricle. It prevents the backflow of blood from left ventricle into left atrium during ventricular contraction.

B. Thebasian valve is present on the opening of coronary sinus. It allows passage of blood into right atrium.

C. Eustachian valve is present on the opening of post caval vein (posterior vena cava). It allows the passage of blood in right atrium.

D. Bicuspid valve is another name for mitral valve.

So, the correct answer is 'Eustachian valve'.