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Are extrinsic muscle pumps found only in animals with rudimentary circulatory systems? If so, why? If...

Are extrinsic muscle pumps found only in animals with rudimentary circulatory systems? If so, why? If not, why not?

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Answer #1

Extrinsic muscle pumps utilize muscle movement for flow of water in and out of the body.

Extrinsic muscles is helpful in circulation in animals with rudimentary circulatory system. These include platyhelminthes, nematodes, cnidarians.

Apart from this extrinsic muscles also help in blood flow in vertebrates in some regions of the body. For example, the calf muscles contract to facilitate flow of blood to the calfs. The back flow of blood prevented by valves.

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