Which valve is between the left atrium and the left ventricle?

• A. Aortic Valve
• B. Tricuspid Valve
• C. Pulmonary Valve
• D. Mitral (Bicuspid) Valve

Answer: (D)

The valve between the left atrium and the left ventricle is the mitral valve, also known as the bicuspid valve. It sits at the left side of the heart and has two cusps that open to allow blood to flow from the left atrium into the left ventricle during diastole, then close during systole to prevent backflow into the atrium. This one-way flow is essential for proper filling of the left ventricle before it pumps blood to the body. Other valves include the aortic valve (between the left ventricle and the aorta), the pulmonary valve (between the right ventricle and the pulmonary artery), and the tricuspid valve (between the right atrium and right ventricle).