name the system in which the blood pumped by the heart is circulated through a close network?

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the name of the system in which blood is circulated through a closed network formed by the heart.

2. **Identifying the Key Terms**: The key terms in the question are "blood," "heart," and "closed network." This indicates that we are looking for a specific type of circulatory system.

3. **Recalling Biological Concepts**: In biology, there are two main types of circulatory systems: open and closed. In an open circulatory system, blood is not confined to vessels and can flow freely in the body cavity. In a closed circulatory system, blood is contained within blood vessels.

4. **Defining the Closed Circulatory System**: The closed circulatory system is characterized by the presence of blood vessels that transport blood. Blood is pumped by the heart through arteries to various parts of the body and returns through veins back to the heart.

5. **Identifying Components**: In a closed circulatory system, there are three main types of blood vessels:
- **Arteries**: Carry oxygenated blood away from the heart to the body.
- **Veins**: Carry deoxygenated blood back to the heart.
- **Capillaries**: Microscopic vessels where the exchange of gases, nutrients, and waste occurs between blood and tissues.

6. **Conclusion**: Therefore, the system in which blood pumped by the heart is circulated through a closed network is called the **closed circulatory system**.

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