Blood pumped by the heart passes into sinuses in

Options

A. Fishes
B. Earthworms
C. Insects
D. Birds

Answer

To solve the question "Blood pumped by the heart passes into sinuses in," we need to analyze the options provided and understand the circulatory systems of the organisms mentioned.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about which organism's blood, after being pumped by the heart, passes into sinuses. Sinuses are spaces or cavities in the body where blood can flow.

2. **Analyzing the First Option - Fishes**:
- Fishes have a two-chambered heart consisting of one atrium and one ventricle.
- In fishes, blood is pumped from the heart into the gills and then into sinuses, specifically the sinus venosus, before it returns to the heart.
- Therefore, this option is likely correct.

3. **Analyzing the Second Option - Earthworms**:
- Earthworms have a closed circulatory system with five pairs of aortic arches, often referred to as their heart.
- Blood does not pass into sinuses; instead, it flows through vessels.
- Hence, this option is incorrect.

4. **Analyzing the Third Option - Insects**:
- Insects have an open circulatory system where blood (hemolymph) is pumped by a dorsal vessel.
- While they do have spaces where blood flows, they do not have true sinuses in the same sense as fishes.
- Thus, this option is also incorrect.

5. **Analyzing the Fourth Option - Birds**:
- Birds have a four-chambered heart with two atria and two ventricles.
- Blood is pumped through a closed circulatory system and does not pass into sinuses.
- Therefore, this option is incorrect as well.

6. **Conclusion**: After analyzing all options, the only organism where blood pumped by the heart passes into sinuses is **Fishes**.

### Final Answer:
The correct answer is **Fishes**.

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