How does blood circulation occur in fishes?

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Detailed Solution

In fishes, blood circulation occurs through a simple system called single circulation. This means that the blood passes through the heart only once during a complete cycle of circulation.

Explanation:

Fishes have a two-chambered heart which includes:

One atrium (receives blood)
One ventricle (pumps blood)

The process works like this:

The heart pumps deoxygenated blood (blood without oxygen) to the gills through arteries.
In the gills, the blood gets oxygenated (receives oxygen) through gaseous exchange with water.
This oxygen-rich blood then flows from the gills to the rest of the body.
After delivering oxygen to the body tissues, the blood returns to the heart again in a deoxygenated form, and the cycle repeats.

Conclusion:

In fishes, the heart never pumps oxygen-rich blood, unlike humans. This single circulation system is efficient for aquatic animals like fishes because their gills act as both respiratory and filtering organs.

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