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Paper 4Theory (Extended)2 marks
Fish have a single circulatory system where blood flows through the heart once during each complete circuit of the body.
Diagram Description
Single Circulation in Fish
A diagram shows the heart pumping deoxygenated blood to the gills, where it becomes oxygenated. The oxygenated blood then flows to the body tissues before returning to the heart.
| Step | Description |
|---|---|
| 1 | Heart pumps deoxygenated blood to the gills |
| 2 | Blood is oxygenated at the gills |
| 3 | Oxygenated blood flows to the body |
| 4 | Deoxygenated blood returns to the heart |
- a[2]
Describe the process of single circulation in fish.
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