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

Endodermis , Endodermis is the layer of cells surrounding the vascular cyl...

Endodermis is the layer of cells surrounding the vascular cylinder of plants.

Human respiration, Human respiration Human beings are adopted for ter...

Human respiration Human beings are adopted for terrestrial mode of life. They conduct pulmonary respiration. This system consists of external nostrils, nasal cavities, pharyn

Define water losses by insensible perspiration, Define water losses by Inse...

Define water losses by Insensible perspiration? Insensible perspiration accounts for a relatively constant amount of water loss that is proportional to the surface area of the

Triploblastic, What Is the advantage of having a coelomic body cavity

What Is the advantage of having a coelomic body cavity

Tallness trait of a pea plant, What is the tallness trait of a pea plant mo...

What is the tallness trait of a pea plant moving separately from the color trait an example of? This is an instance of Mendel's second law, the Law of Independent Assortment, w

#green algae, #what characteristics of green algae that led to biologists c...

#what characteristics of green algae that led to biologists considered it as a plant?

Explain database search, Database Search: Once an open reading frame or th...

Database Search: Once an open reading frame or the partial amino acid sequence has been pre-determined, the investigator compares sequence with others in the databases using a com

Define primary level care - public nutrition, Define Primary Level Care - P...

Define Primary Level Care - Public Nutrition? This is the first level of contact of an individual, the family and the community with the national health system. It is possible

Explain water - an essential but overlooked nutrient, Explain Water - An Es...

Explain Water - An Essential but Overlooked Nutrient? You may already know that the total body water (TBW) constitutes 50-60% of the body weight. A 70 kg 'standard male' contai

Explain about the nutrition security, Explain about the Nutrition Security?...

Explain about the Nutrition Security? Food security is a part of the broader concept of nutrition security. A household can be said to be nutritionally secure if it is able to

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