Name the sytem in which the blood pumped by the heart is circulated through large vessels into sinuses?

Answer

To answer the question, "Name the system in which the blood pumped by the heart is circulated through large vessels into sinuses," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Circulatory Systems**: Begin by recognizing that there are two main types of circulatory systems in organisms: open circulatory systems and closed circulatory systems.

2. **Defining Open Circulatory System**: In an open circulatory system, the blood is not confined exclusively to blood vessels. Instead, it is pumped by the heart into large vessels that lead to open cavities or spaces within the body.

3. **Identifying Sinuses**: The term "sinuses" refers to these open spaces or cavities where the blood flows freely. This is a key characteristic of the open circulatory system.

4. **Contrasting with Closed Circulatory System**: In contrast, a closed circulatory system keeps the blood contained within blood vessels at all times, which does not involve sinuses.

5. **Conclusion**: Based on the definitions and characteristics of the circulatory systems, the system in which blood is pumped by the heart through large vessels into sinuses is the **open circulatory system**.

### Final Answer:
The system in which the blood pumped by the heart is circulated through large vessels into sinuses is the **open circulatory system**.