The course of blood from the heart to the lungs and back to the heart is called

Options

A. Systemic circulation
B. Pulmonary circulation
C. Singe circulation
D. double circulation

Answer

To answer the question "The course of blood from the heart to the lungs and back to the heart is called," we will analyze the options provided and identify the correct term for this specific circulation process.

### Step-by-Step Solution:

1. **Understanding Circulation Types**:
- There are different types of blood circulation in the body, primarily systematic circulation and pulmonary circulation.

2. **Systematic Circulation**:
- This type of circulation refers to the movement of blood between the heart and the rest of the body. It is not the correct answer for the blood flow specifically to the lungs.

3. **Pulmonary Circulation**:
- This is the process where the right ventricle of the heart pumps deoxygenated blood through the pulmonary artery to the lungs.
- In the lungs, the blood gets oxygenated.
- The oxygenated blood then returns to the heart through the pulmonary veins.

4. **Single Circulation**:
- This type of circulation occurs when blood passes through the heart only once in a complete circuit. It is typically seen in fish and is not applicable to the question.

5. **Double Circulation**:
- This refers to the circulation system where blood passes through the heart twice. It is seen in humans and some other animals, but it does not specifically describe the route to the lungs.

6. **Conclusion**:
- Based on the above analysis, the correct term for the course of blood from the heart to the lungs and back to the heart is **pulmonary circulation**.

### Final Answer:
The course of blood from the heart to the lungs and back to the heart is called **pulmonary circulation**.

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