Blood leaving the right atrium flows into the:

• A. Right Ventricle
• B. Pulmonary Arteries
• C. Superior Vena Cava
• D. Left Ventricle

Answer: (A)

Blood moves from the right atrium into the right ventricle through the tricuspid valve. The right atrium collects deoxygenated blood from the body, and the next step in that flow is into the right ventricle, which then pumps blood to the lungs via the pulmonary arteries. The other vessels have different roles: the superior vena cava brings blood into the right atrium, the pulmonary arteries carry blood away from the right ventricle to the lungs, and the left ventricle sits on the other side of the heart, receiving blood from the left atrium.