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

Explain didanosine and its adverse effects, Didanosine (ddl, Videx)   Di...

Didanosine (ddl, Videx)   Didanosine is available as buffered tablets, buffered or non-buffered powder, and non-buffered enteric-coated capsules (Videx EC). Adverse effects

Sex, pls enlighten me

pls enlighten me

Can you explain coronary angioplasty, Q. Can you explain Coronary Angioplas...

Q. Can you explain Coronary Angioplasty? The concept of coronary angioplasty - enlargement of the lumen of a stenotic vessel by a catheter technique was first proposed by Dotte

Heart in amphibians, Amphibia n - 3 chambered heart 2 auricles and ...

Amphibia n - 3 chambered heart 2 auricles and 1 ventricle. Sinus venosus and truncus arteriosus (its main part is pylengium) present. Incomplete double circulation prese

Why is carbon monoxide toxic for humans, Q. Why is carbon monoxide toxic fo...

Q. Why is carbon monoxide toxic for humans? Hemoglobin "likes" carbon monoxide (CO) much more than it likes oxygen. When there is carbon monoxide in the inhaled air it binds to

Distal convoluted tubule, Normal 0 false false false EN...

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

Metamorphosis, ME T AMORPHOSIS The differentiation results in the for...

ME T AMORPHOSIS The differentiation results in the formation of larva / infant. The formation of adult from the larva / infant is called as metamorphosis. The metamorph

Explain nutritional biochemistry, Explain Nutritional Biochemistry A  ...

Explain Nutritional Biochemistry A  good understanding  of the  biochemical  basis  of  nutrient function  and  of  the consequence of nutrient deficiency  or excess  is  impo

Dna, What is a helix?

What is a helix?

Determine the chance of developing cancer, A typical chest x-ray exposes th...

A typical chest x-ray exposes the patient to a radiation dose of 0.01 rem. If a man receives 10 such x-rays in a lifetime, what is his chance of developing cancer as a result of th

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