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
How does vitamin C act in the body? What is the harm caused by insufficiency of vitamin C? Why was this deficiency also known as "sailors' disease"? Vitamin C, or ascorbic acid

REFLE X ACTION - Marshel Hall discovered reflex action. Best & Taylor defined it. Reflex action is functional unit of CNS. It is sudden, immediate involuntary acti

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

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Class of Crustacea - Cirripedia These crustaceans are completely marine, and include the barnacles. Moa species are free living, attached to rock, and other objects. Some are

Give three examples of human disorders which are caused by the action of a single pair of alleles. In every case say whether the harmful allele is dominant or recessive to the non-

Give a short explanation of what UPS really means and why it is so important to health practitioners and consumers/patients.

Explain the Analysis of food production? The agricultural sector is known for its diversity and heterogeneity of decisions right from the farm to the entire marketing system. A

Q. What is the chorioallantois membrane present in the embryonic development of birds and reptiles? How does this membrane participate in the energetic metabolism of the embryo?