Classification of multicellular animals - coelom, Biology

Classification of Multicellular Animals - Coelom

We know earlier that the pseudocoel gave animals specific selective benefits. Among other things, this fluid-tilled space worked as a hydrostatic skeleton increasing the efficiency of burrowing. However, in pseudocoelomates, organs lay loose in the body cavity. To circumvent this drawback, coelom evolved within mesoderm. The result was that the new body cavity, that is the coelom, came to be lined by mesodermal layer (peritoneal layer). The various organs also came to be suspended in the coelom through the mesodermal layer called mesenteries. This enabled the body wall to become much more muscular, with better developed longitudinal and circular muscles. The body cavity so became a more efficient hydrostatic skeleton now. The alimentary canal also became more muscular and more specialised. Various organs became better arranged in a much more stable way, without interfering with one another. The mesenteries as well served as a better medium for positioning blood vessels to the respective organs. So, development of coelom has been a main step in the evolution of more complex and larger animals.

Posted Date: 2/2/2013 12:25:13 AM | Location : United States







Related Discussions:- Classification of multicellular animals - coelom, Assignment Help, Ask Question on Classification of multicellular animals - coelom, Get Answer, Expert's Help, Classification of multicellular animals - coelom Discussions

Write discussion on Classification of multicellular animals - coelom
Your posts are moderated
Related Questions
SKIN - Largest organ of body. It is covered by hairs or pelage i.e. pillifera. Study of skin is dermatology. Outermost covering of body. Skin is elastic and

What are the five human digestive secretions? Which of them is the only one that does not contain digestive enzymes? The human digestive secretions such as: saliva, gastric jui

Evolution of migration Eg Benefits associated with migratory flights must be greater than those associated with staying in Alaska and having to tolerate seasonal changes

Features of Plant and Animal Cell However plant and animal cells also differ. One of the most prominent features of the plant cell is its huge vacuoles filled with cell sap.

Which is the brain region responsible for the regulation of breathing and blood pressure? The neural regulation of breathing, blood pressure and other physiological parameters

The  nitrogenase  complex  is  extremely  sensitive  to  inactivation  by  O2,  so  the enzyme  must be protected  from this reactive  substance.  During the root nodules of legumi

What are the three main types of trophic pyramids studied in Ecology? The three types of trophic pyramids studied in Ecology are the numeric pyramid, the biomass pyramid and th

Determine in brief about the Classic migraine This is probably the most interesting form, occurring in about 12% of migraine sufferers, because it begins with an aura, which us

Applications of microbiology in different fields

do fats with one or more 'kinky' tail fatty acids tend to be solid or liquid at room temperature? These are found in triglycerides forming what? Solid fats or oils? Is it opposite