In order for the blood to flow right atrium to left ventricle in mammalian heart, it must flow through

Options

A. right ventricle, pulmonary arteries, lungs, pulmonary veins, left atrium
B. right ventricle, pulmonary veins, lungs, pulmonary arteries, left atrium
C. right ventricle, right atrium, lungs, pulmonary veins, left atrium
D. right ventricle,system aorta, lungs, pulmonary veins, left atrium

Answer

To determine the pathway for blood to flow from the right atrium to the left ventricle in the mammalian heart, we can break down the process step by step:

1. **Blood enters the right atrium**: The journey begins when deoxygenated blood returns to the heart from the body through two major veins: the superior vena cava and the inferior vena cava. This blood collects in the right atrium.

2. **Blood flows to the right ventricle**: From the right atrium, the blood flows through the tricuspid valve into the right ventricle. This valve prevents backflow when the ventricle contracts.

3. **Blood is pumped to the lungs**: When the right ventricle contracts, it pumps the deoxygenated blood into the pulmonary artery. This artery carries the blood away from the heart to the lungs for oxygenation.

4. **Blood gets oxygenated in the lungs**: In the lungs, carbon dioxide is exchanged for oxygen. The blood becomes oxygenated during this process.

5. **Oxygenated blood returns to the heart**: The oxygen-rich blood is then transported back to the heart via the pulmonary veins. These veins carry the oxygenated blood to the left atrium.

6. **Blood flows to the left ventricle**: From the left atrium, the oxygenated blood passes through the mitral valve into the left ventricle.

7. **Blood is pumped to the body**: Finally, when the left ventricle contracts, it pumps the oxygenated blood out through the aorta, distributing it to the rest of the body.

Thus, the complete pathway for blood to flow from the right atrium to the left ventricle is: **Right Atrium → Right Ventricle → Pulmonary Artery → Lungs → Pulmonary Veins → Left Atrium → Left Ventricle.**