Which of the following is the correct sequence of blood flow through heart chambers?
Right atrium → Right ventricle → Left atrium → Left ventricle
Pathway of blood through the heart (double circulation):
1. Deoxygenated blood from the body enters the right atrium via the superior and inferior vena cavae.
2. From the right atrium, blood flows through the tricuspid valve into the right ventricle.
3. The right ventricle pumps deoxygenated blood through the pulmonary artery to the lungs (pulmonary circulation), where it gets oxygenated.
4. Oxygenated blood returns to the left atrium via the pulmonary veins.
5. From the left atrium, blood passes through the bicuspid (mitral) valve into the left ventricle.
6. The left ventricle pumps oxygenated blood through the aorta to the rest of the body (systemic circulation).
Hence, the correct sequence is Right atrium → Right ventricle → Left atrium → Left ventricle.
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