Blood pumped out of heart bathes the tissues directly , in`…….`types of circulatory system

Options

A. closed
B. open
C. both (1) and (2)
D. none of these

Answer

To answer the question "Blood pumped out of heart bathes the tissues directly, in which type of circulatory system?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of Circulatory Systems**:
- There are two main types of circulatory systems: open and closed.
- In an open circulatory system, blood is not confined to blood vessels and bathes the organs directly in a body cavity.
- In a closed circulatory system, blood is contained within vessels and is circulated through a network of arteries and veins.

2. **Identify Characteristics of Open Circulatory System**:
- In an open circulatory system, the blood (often referred to as hemolymph in invertebrates) is pumped by the heart into a hemocoel (body cavity).
- The blood then directly bathes the tissues and organs, allowing for nutrient and gas exchange.

3. **Identify Characteristics of Closed Circulatory System**:
- In a closed circulatory system, blood circulates within a system of vessels.
- The heart pumps blood through arteries, which branch into smaller arterioles and capillaries, where exchange with tissues occurs.

4. **Determine the Correct Answer**:
- Since the question states that blood bathes the tissues directly, this is characteristic of an open circulatory system.
- Therefore, the correct answer is option number two: open circulatory system.

### Final Answer:
Blood pumped out of the heart bathes the tissues directly in an **open circulatory system**.

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