Which is the correct sequence for normal blood flow from the body to the aorta?

• A. Right Atrium → Tricuspid Valve → Right Ventricle → Lungs → Pulmonary Valve → Left Atrium → Bicuspid Valve → Left Ventricle → Aortic Valve → Aorta
• B. Superior Vena Cava → Right Atrium → Tricuspid Valve → Right Ventricle → Lungs → Pulmonary Valve → Left Atrium → Bicuspid Valve → Left Ventricle → Aortic Valve → Aorta
• C. Aorta → Systemic Circulation → Superior Vena Cava
• D. Pulmonary Veins → Left Atrium → Bicuspid Valve → Left Ventricle → Aorta

Answer: (B)

The path tests how blood completes one full circuit through the heart and lungs: returning from the body to the right heart, moving to the lungs for oxygen, then returning to the left heart to be pumped out to the body.

Blood from the body returns via the superior vena cava into the right atrium, then passes through the tricuspid valve into the right ventricle. From there it is pumped through the pulmonary valve into the pulmonary arteries and travels to the lungs for oxygenation. After picking up oxygen, the blood returns to the heart via the pulmonary veins into the left atrium, moves through the bicuspid (mitral) valve into the left ventricle, and is then ejected through the aortic valve into the aorta to supply the body.

The option that starts with the return to the heart via the superior vena cava and ends with the blood entering the aorta matches this sequence of steps, making it the correct choice. Other options either misplace the lungs and valve steps or skip parts of the circuit.