Dictionary » H » Hydra



(Science: organism) genus of freshwater coelenterates (cnidarians). They are small, solitary and only exist in the polyp form, which is a radially symmetrical cylinder that is attached to the substratum at one end and has a mouth surrounded by tentacles at the other. They have considerable powers of regeneration and have been used in studies on positional information in morphogenesis.

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Re: Respiration of a polyp (hydra)

Hydra are diploblastic, i.e. they have only two cell layers. Respiration is by simple diffusion.

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by Gavin
Fri Oct 28, 2011 1:19 am
Forum: Zoology Discussion
Topic: Respiration of a polyp (hydra)
Replies: 1
Views: 2411

Respiration of a polyp (hydra)

How does a polyp respire? Couldn't find any answer in the internet...

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by tillL
Thu Oct 27, 2011 3:34 pm
Forum: Zoology Discussion
Topic: Respiration of a polyp (hydra)
Replies: 1
Views: 2411

human age and biology

Why do most organisms grow old and die, while some (e.g., hydra) are immortal? Is there an adaptive advantage to ageing? One theory is "antagontistic pleiotropy," proposed by George C. Williams (who recently died at the age of 84). :( This theory ...

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by StevePush
Wed Oct 06, 2010 2:36 pm
Forum: Evolution
Topic: human age and biology
Replies: 17
Views: 12608

Human aging

Also, you know Hydra which it hs been oberseved that they live for very long period without intrinsic aging because the stem cells permeate its body. It sounds like their stem cells do not accumulated mutations...

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by pomkon
Fri Jan 09, 2009 6:10 pm
Forum: Genetics
Topic: Human aging
Replies: 20
Views: 20403

Vertabrates digestion vs invertebrates digestion

Pick a couple of sample species and compare them. Suggestions: Hydra, bacteria, sponge, venus fly trap, earthworm.

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by mith
Sat Jun 09, 2007 2:42 pm
Forum: General Discussion
Topic: Vertabrates digestion vs invertebrates digestion
Replies: 6
Views: 6247
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