Give the difference between open and closed circulation.

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Solution

Open circulation Closed circulation

Blood pumped by the heart passes through large vessels into open spaces or body cavities. Blood pumped by the
heart is always
circulated through a closed network of blood vessels.

The tissues of the body are in direct contact with the blood. The tissues are not in direct contact with the blood.

This is primitive circulation. This is advanced circulation.

Example:
Arthropods,
Mollusca, and more. Example: All vertebrates, Some invertebrates like earthworm and more.

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Open circulation	Closed circulation
Blood pumped by the heart passes through large vessels into open spaces or body cavities.	Blood pumped by the heart is always circulated through a closed network of blood vessels.
The tissues of the body are in direct contact with the blood.	The tissues are not in direct contact with the blood.
This is primitive circulation.	This is advanced circulation.
Example: Arthropods, Mollusca, and more.	Example: All vertebrates, Some invertebrates like earthworm and more.