Blood circulation that starts in capillaries and ends in capillaries is called

Options

A. Portal circulation
B. Hepatic circulation
C. Cardiac circulation
D. None of these

Answer

### Step-by-Step Solution:

1. **Understanding Blood Circulation**: Blood circulation refers to the movement of blood throughout the body, which can occur in various pathways.

2. **Identifying the Types of Circulation**: The question provides four options:
- Portal circulation
- Hepatic circulation
- Cardiac circulation
- None of these

3. **Defining Portal Circulation**: Portal circulation is a specific type of blood circulation that begins in the capillaries of one organ and ends in the capillaries of another organ before returning to the heart.

4. **Example of Portal Circulation**: A common example is the hepatic portal circulation, where blood flows from the capillaries of the intestines to the capillaries of the liver via the hepatic portal vein. This means that blood from the intestines (which is rich in nutrients) is processed by the liver before it returns to the heart.

5. **Conclusion**: Since the question asks for blood circulation that starts in capillaries and ends in capillaries, the correct answer is **portal circulation**.

### Final Answer:
The blood circulation that starts in capillaries and ends in capillaries is called **portal circulation**.