Classification of multicellular animals - coelom, Biology

Assignment Help:

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.


Related Discussions:- Classification of multicellular animals - coelom

Protozoa, locomotion in parameceum

locomotion in parameceum

Insulation by fur and feathers, Normal 0 false false false ...

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

What is xaxim, Q. What is xaxim? Most pteridophytes have subterraneous ...

Q. What is xaxim? Most pteridophytes have subterraneous stems similar to the substrate called as rhizomes. Xaxim is a kind of pteridophyte with an aerial stem in generally perp

Pulmonary valvotomy on cardio pulmonary bypass, Pulmonary Valvotomy on ...

Pulmonary Valvotomy on Cardio Pulmonary Bypass :  Patient is connected to cardio pulmonary bypass using ascending aortic cannula and single 01- double (preferred) ven

Mechanisms of hemorrhage contention, Q. What are the mechanisms of hemorrha...

Q. What are the mechanisms of hemorrhage contention called? The physiological mechanisms of hemorrhage contention one of them is blood clotting are generically named hemostatic

Objective of nutrient needs during periods of pregnancy, Define Objective o...

Define Objective of nutrient needs during periods of pregnancy? describe the various physiological changes during pregnancy, describe foetal growth and development and

Types of changes encountered during the support phase, What are the types o...

What are the types of changes encountered during the Support phase Adaptation - To accommodate changes to its environment Correction - To uncover defects in the Software

What are the human tissues affected by malaria, Q. What are the human tissu...

Q. What are the human tissues affected by malaria? What are the main clinical manifestations of the disease? A plasmodium contaminates the human blood causing destruction of RB

Describe the technique of food processing, Technique of food processing ...

Technique of food processing Freezing is another ancient technique of food processing, which allows the transportation of perishable food items for long distances from producti

Explain the procedure of balloon pulmonary valvuloplasty, Q. Explain the pr...

Q. Explain the procedure of Balloon Pulmonary Valvuloplasty? Right heart study is done to measure the transvalvular gradient and exclude supravalvular and subvalvular component

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd