Question

In mammals, the bicuspid (mitral valve), guards the opening between

• A. Left atrium and left ventricle
• B. Pulmonary vein and left auricle
• C. Stomach and intestine
• D. Right atrium and right ventricle

Answer 1

Answer: (A)

Left atrium and left ventricle

Valves are the membranous structure that prevents the backflow of the blood. The left atrioventricular valve is the 'bicuspid valve', but it is usually referred to as the 'mitral valve'. It has two rather heavy cusps, that permit blood to flow freely from the left atrium into the left ventricle. However, the cusps close when the left ventricle begins to contract; this prevents blood from returning to the left atrium and ensures the forward flow of blood into the aorta.

So, the correct answer is option A.