Systematic circulation of oxygenated blood starts from

Options

A. Right atrium
B. Left atrium
C. Left ventricle
D. Right ventricle

Answer

To answer the question regarding where the systematic circulation of oxygenated blood starts, we can break down the explanation into clear steps:

### Step-by-Step Solution:

1. **Understanding Systematic Circulation**:
- Systematic circulation refers to the movement of oxygenated blood from the heart to the body tissues and back to the heart. It is part of the double circulation system, which also includes pulmonary circulation (the movement of blood between the heart and lungs).

2. **Identifying the Starting Point**:
- The systematic circulation begins in the heart, specifically from the left side of the heart.

3. **Left Ventricle**:
- The left ventricle is the chamber of the heart responsible for pumping oxygenated blood into the systemic circulation.

4. **Aorta**:
- From the left ventricle, the oxygenated blood is pumped into the aorta, which is the largest artery in the body. The aorta then branches out to supply blood to various body tissues.

5. **Blood Flow to Body Tissues**:
- The oxygenated blood travels through smaller arteries and arterioles to reach the capillaries, where oxygen is delivered to the tissues.

6. **Return to the Heart**:
- After delivering oxygen, the deoxygenated blood returns to the heart through veins, ultimately collecting in the vena cava, which empties into the right atrium of the heart.

### Conclusion:
- Therefore, the systematic circulation of oxygenated blood starts from the **left ventricle** of the heart.

### Answer:
The systematic circulation of oxygenated blood starts from the **left ventricle**.

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