do cnidarians breathe


Cnidarians Respiration Method | eHow

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5. Cnidarians Respiration Method

** Cnidarians Respiration Method **

By Peg Robinson
eHow Contributor

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Found This Helpful

Cnidarians are jellyfish. Jellyfish have no lungs or gills, yet they must
still breathe. The method of direct oxygen exchange allows the jellyfish to
survive.

-Other People Are Reading-

· How Do Sponges Breath?
· What Are the Differences & Similarities Between Mammals & Reptiles?

*Jellyfish*

· Cnidarians are free-swimming jellies common to the world's oceans, with
some few species occasionally found in fresh water. Jellyfish are
invertebrates, with no spine, limited exoskeletons, and a nervous system
but no brain. They also have no lungs or gills. The only respiratory
technique jellies have is direct absorption of dissolved oxygen from the
water.

*Method*

· For direct absorption to work certain things must be true. An animal
that absorbs its oxygen though the skin without use of a lung or gill
system must exist in a damp environment--oxygen absorption of any sort
requires hydrogen atoms to bond with the oxygen prior to the oxygen being
bonded with another element in the body, and the most common source


Source: www.ehow.com/way_5723865_cnidarians-respiration-method.html

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