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

Post operative anticoagulation, Post Operative Anticoagulation :  Thromboe...

Post Operative Anticoagulation :  Thromboembolism remains a serious complication after valve replacement. Lifelong anticoagulation is requised for all patients with a prosthetic v

Which are the glands present in the epidermis of mammals, Which are the gla...

Which are the glands present in the epidermis of mammals, birds and reptiles? In the epidermis of birds and reptiles there are almost no glands. In mammals there are sweat glan

Explain the air sampling, Explain the Air Sampling? Microorganisms may ...

Explain the Air Sampling? Microorganisms may be present in air of processing facility and have an impact on the quality and safety of foods processed and handled there. To avoi

Excretion in flatworm, EXCRETIO N IN FLATWORM - Main organs are flame ...

EXCRETIO N IN FLATWORM - Main organs are flame cells, having bundle of cillia. It receives solute and water from surrounding tissue fluid by ultra filtration & discharge th

Self help group - psychoactive substance use disorders, Self Help Group: ...

Self Help Group: The first and perhaps the most influential of substance abuse rehabilitation is Self Help Group. The self help programme was founded in 1935 by two men, Dr. B

Investigation of tricuspid stenosis by echocardiography, Q. Investigation o...

Q. Investigation of Tricuspid stenosis by Echocardiography? Findings are subtle. One should carefully search for organic tricuspid valve involvement in all rheumatic heart dise

Reproduction, site of fertilistion in human

site of fertilistion in human

Characteristics of the age pyramids of developed countries, Q. What are the...

Q. What are the main characteristics of the age pyramids of developed countries? In the stabilized human population the age pyramid has a narrower base since the reproduction r

Explain counseling children, Counseling children Assess the child's sta...

Counseling children Assess the child's stage of development. Adjust counseling for a child's  dependency needs,  lack of  experience and  the development tasks faced by  him

Meiosis, does crossing over occur in all the homologous chromosomes???

does crossing over occur in all the homologous chromosomes???

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