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

Blood, How the blood is circulated with the help of Heart?

How the blood is circulated with the help of Heart?

Bacteria is an obligate anaerobe, Q. What is signifying when it is said tha...

Q. What is signifying when it is said that a bacteria is an obligate anaerobe? Obligate anaerobes are those living beings that do not survive in the presence of oxygen. For exa

Consequences of diarrhoea, All of us must have suffered from diarrhoea at l...

All of us must have suffered from diarrhoea at least once in our lifetime. How do you feel thereafter? Well most of us must have experienced weakness, dizziness, dryness of mouth a

Important aspects of nutritional needs during emergency, Define important a...

Define important aspects of nutritional needs during emergency situations? This unit discussed important aspects of nutritional needs during emergency situations and under envi

Explain the lateral and the apical buds of the plants, What is the differen...

What is the difference between the lateral and the apical buds of the plants? Lateral buds are portions of meristematic tissue situated in the base of the shoots. Apical bud

Lipoidal models, LIPOIDA L MODELS According to Overton (1902) plasm...

LIPOIDA L MODELS According to Overton (1902) plasma membrane consists of single layer of lipid, because cell permeability is related to lipids. According to Gorter and

What are the near point and the far point of the vision, What are the near ...

What are the near point and the far point of the vision? The near point is the closest distance among an object and the eye that makes possible the formed image to be focused,

What are the main respective constituents of cell walls in, What are the ma...

What are the main respective constituents of cell walls in bacteria, protists, fungi and plants? In bacteria the cell wall is made of peptidoglycans; between protists algae hav

Explain the bulimia nervosa, Explain the Bulimia Nervosa? Diagnostic Cr...

Explain the Bulimia Nervosa? Diagnostic Criteria Bulimia Nervosa patients, unlike those of anorexia nervosa with binge and purge subtype, are typically within the normal weight

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