Which of the following options represents correct systemic circulation in human being ?

Options

A. Left ventricle `underset("blood")overset("Deoxygenated")(rarr)` Tissues `underset("blood")overset("Oxygenated")(rarr)` Right ventricle
B. Right ventricle `underset("blood")overset("Oxygenated")(rarr)` Tissues`underset("blood")overset("Deoxygenated")(rarr)` Right auricle
C. Left ventricle `underset("blood")overset("Deoxygenated")(rarr)` Tissues `underset("blood")overset("Oxygenated")(rarr)` Right auricle
D. Left ventricle `underset("blood")overset("Oxygenated")(rarr)` Tissues `underset("blood")overset("Deoxygenated")(rarr)` Right auricle

Answer

To determine the correct representation of systemic circulation in humans, we need to understand the flow of blood through the heart and the body. Here’s a step-by-step breakdown of the systemic circulation process:

### Step-by-Step Solution:

1. **Oxygenated Blood from Lungs**: Blood that is rich in oxygen returns from the lungs to the heart. This occurs through the pulmonary veins, which lead to the left atrium (upper chamber of the heart).

2. **Left Atrium to Left Ventricle**: From the left atrium, the oxygenated blood flows through the mitral valve into the left ventricle (lower chamber of the heart).

3. **Pumping Oxygenated Blood**: The left ventricle then contracts and pumps the oxygen-rich blood through the aortic valve into the aorta, which is the main artery that distributes oxygenated blood to the rest of the body.

4. **Oxygen Delivery to Tissues**: The oxygen-rich blood travels through the systemic arteries and reaches various tissues and organs, delivering oxygen and nutrients.

5. **Return of Deoxygenated Blood**: After delivering oxygen, the blood becomes deoxygenated and returns to the heart through the systemic veins. This blood enters the heart via the superior vena cava and inferior vena cava, which lead to the right atrium (upper chamber of the heart).

6. **Right Atrium to Right Ventricle**: The deoxygenated blood then flows from the right atrium through the tricuspid valve into the right ventricle (lower chamber of the heart).

7. **Pulmonary Circulation**: Finally, the right ventricle pumps the deoxygenated blood to the lungs through the pulmonary arteries for oxygenation, completing the cycle.

### Conclusion:
The correct representation of systemic circulation in humans is that the left ventricle pumps oxygenated blood to the tissues, and the tissues return deoxygenated blood to the right atrium. Thus, the correct option is **Option D**: "Left ventricle pumps the oxygenated blood to the tissues and tissues pump the deoxygenated blood to the right auricle."

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