coelenterata has body cavity but it is not a coelomate why?

Question

Answer

Coelenterates have gastrovascular cavity. (it's tube like which take up food through water and help in digestion ,,,,,but it is can't be called an coelom ) ...... coelenterates has no true coelome bcoz coelenterates are diplobalstic with no mesoderm..... coelome is the cavity which is formed up by continuous splitting in mesoderm... as there is no mesoderm.. thereby no coelome.... so they are not coelomate... .

Answer

Since coelenterates possess only body cavity and no development of mesoderm in germ layer and no true internal coelom, they are not considered coelomates in which well differentiated organs can be accommodated.

Answer

Coelenterata, also known as Cnidaria, is a phylum of aquatic animals that includes jellyfish, corals, sea anemones, and hydroids. While they possess a body cavity, known as the gastrovascular cavity, they are not considered coelomates. This is because the gastrovascular cavity differs from a true coelom in terms of its development, structure, and function.

Development:
A true coelom is derived from the mesoderm, one of the three primary germ layers in animals. It develops as a fluid-filled space completely lined by mesodermal tissue. In coelenterates, however, the gastrovascular cavity is derived from the endoderm, which is the innermost germ layer. It forms as an invagination of the ectoderm during embryonic development, rather than originating from mesodermal tissue.

Structure:
The gastrovascular cavity in coelenterates is a simple sac-like structure that functions in both digestion and circulation. It is a single chamber that serves multiple purposes, including the intake and digestion of food, as well as the distribution of nutrients and removal of waste products. In contrast, a true coelom is a more complex and organized cavity that is divided into multiple compartments by mesodermal membranes known as mesenteries.

Function:
The gastrovascular cavity of coelenterates functions as a primitive digestive and circulatory system. It allows for extracellular digestion, where the enzymes secreted by the inner lining of the cavity break down food particles into smaller molecules that can be absorbed directly by the cells lining the cavity. The nutrients are then transported to other parts of the body through diffusion. In coelomates, on the other hand, the coelom serves as a space for the development and movement of internal organs, as well as for the circulation of fluids that transport nutrients, gases, and waste products.

Conclusion:
In summary, although coelenterates possess a body cavity known as the gastrovascular cavity, it is not considered a true coelom. The gastrovascular cavity differs in its development, structure, and function from the coelom found in coelomates. Understanding these differences helps to clarify the classification and characteristics of these organisms within the animal kingdom.

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