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

Define significance of plants and animals on human life, Define Significanc...

Define Significance and Impact of Plants and Animals on Human Life? Plants and animals both have a great significance and unparalleled impact on human life. Most of our needs a

How much fluids should be taken for management of obesity, How much Fluids ...

How much Fluids should be taken for management of obesity? Liberal amounts of water and zero/low calorie fluids may be included in the diet. It may be helpful to have a glass o

How to repair the defects in post myocardial , How to repair the defects in...

How to repair the defects in post myocardial ? Repair of Defect :  The approach to the defect is through ventriculotomy over the infarcted area. The defect is repaired

What is immuno adsorption, It is elimination of an antigen or antibody from...

It is elimination of an antigen or antibody from a sample by the process of adsorption, to which the complimentary antigen or antibody is bound.

Development projects - deforestation, Development Projects - Deforestation ...

Development Projects - Deforestation The use of science and technology to support the ever- increasing needs of man is termed as development. In the recent years, the human po

Explain metabolic response to injury, Explain Metabolic Response to Injury?...

Explain Metabolic Response to Injury? There is an increase in the basal metabolic rate above the normal. The degree of hyper metabolism is related to the severity of the injury

Explain animal sources of natural colourants, Explain Animal sources of Nov...

Explain Animal sources of Novel Sources of Natural Colourants   The most common animal pigments of use as food colourants are those based on the haem structure. In nature, ha

Define half saturation test and full saturation test, Define Half Saturatio...

Define Half Saturation Test and Full Saturation Test? This test is specific to polysaccharides. The test is used to detect dextrin from starch. The details related to the test

Describe ecological phytosociological, Q. Describe Ecological phytosociolog...

Q. Describe Ecological phytosociological? Field studies are desirable for an understanding of the relationship of any group of plants. If it is not possible to study the plants

Functions of the bacterial flora within the human gut, Q. What are the majo...

Q. What are the major functions of the bacterial flora within the human gut? Bacteria that live inside the gut have great importance in digestion. Several polysaccharides like

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