After entering the right atrium, blood passes through which valve to reach the right ventricle?

After entering the right atrium, blood passes through which valve to reach the right ventricle?

• A. Tricuspid valve
• B. Mitral valve
• C. Aortic valve
• D. Pulmonary valve

Answer: (A)

Blood moving from the right atrium to the right ventricle passes through the tricuspid valve. This right-sided atrioventricular valve has three leaflets and works with chordae tendineae and papillary muscles to prevent backflow during ventricular contraction. It opens to allow flow from the atrium into the ventricle and closes when the right ventricle ejects blood into the pulmonary artery. The other valves—mitral between left atrium and left ventricle, aortic from left ventricle to the aorta, and pulmonary from right ventricle to the pulmonary artery—are located on different outflow paths.