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Coelom

Definition

noun, plural: coeloms

(1) A fluid-filled body cavity formed from the splitting of lateral plate mesoderm during embryonic development

(2) A body cavity


Supplement

Animals may be grouped based on the coelom:

Coelom is a crucial step in evolution since a complicated body plan would benefit from it. A coelom allows compartmentalization to separate biological systems that carry out differing major functions. For instance, animals without coelom (acoelomates) would have to rely on diffusion to transport nutrients around the body. Since acoelomates (such as flatworms) are relatively small and have less intricate body plan (flat), diffusion is enough to carry out transport function. However, for animals (such as mammals) that have complicated body plans would need other transport system (circulatory system) apart from diffusion. A coelom would therefore be useful to separate circulatory system from abdominal organs that carry out a different major function (which is digestion). Thus, both of these systems can perform their function separately and with more efficiency. Coelom also allows organs to grow and change in position or shape.


Word origin: Greek koilōma (cavity)

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coelom in urochordates

hi all, can any one explain me exactly that why in urochordates coelom is absent.. I mean to ask how they evolved into such a condition like absence of coelom..? :?:

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by adithya528
Wed Dec 12, 2012 6:12 pm
 
Forum: Zoology Discussion
Topic: coelom in urochordates
Replies: 0
Views: 1009

Book recommendation for exam

... these topic. Paper-1 Section-A 1. Non-chordata and chordata 2. Classfication and relationship of varous phyla upto sub-classes; Acoelomata and Coelomata; Protostomes and Deuterostomes, Bilateralia and Radiata; Status of Protista, Parazoa, Onychophora and Hemichordata; Symmetry. 3. Protozoa ...

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by bertstare
Sun Oct 21, 2012 2:19 pm
 
Forum: Zoology Discussion
Topic: Book recommendation for exam
Replies: 3
Views: 4756

How does blood is circulated in amphibians?

The frog circulatory system consist of two atria and one single ventricle. It is the only organ within the coelom which has its own protective covering. The single ventricle is not divided into two compartments like a humans heart, but it is separated enough for the blood not ...

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by suzidoc8
Mon Jul 23, 2012 2:00 pm
 
Forum: Physiology
Topic: How does blood is circulated in amphibians?
Replies: 4
Views: 5656

Please check my work?

... circulatory system. C two pairs of jointed appendages, cephalization, and internal skeleton. D hydrostatic skeleton, bilateral symmetry, and true coelom. A or C? THANKS IN ADVANCE :wink: :wink: :wink: :wink:

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by radicali
Thu Jun 14, 2012 8:57 pm
 
Forum: General Discussion
Topic: Please check my work?
Replies: 1
Views: 2278

Re: Digestive System Evolution

... possess only a single body cavity, which typically has either digestive or circulatory functions, or both. There is no secondary body cavity, or coelom, and consequently these phyla are referred to as the acoelomates. Most animal phyla, however, have evolved a second body cavity of one form or ...

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by Fransis
Tue Sep 06, 2011 9:18 am
 
Forum: Evolution
Topic: Digestive System Evolution
Replies: 60
Views: 98204
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