![]() Each porocyte allows water to flow inside the spongocoel from surrounding aquatic habitat. ![]() Porocytes are unique, elongated, tubular cells. Digestion is also intracellular, taking place within choanocyte. These cells capture microcopic food particles. Choanocyte also has a collar made of microvilli. The flagella help in creating a unidirectional flow of water around the body of sponge. Moreover choanocytes also give rise to germ cells.Ĭhoanocytes are flagellated cells which line the spongocoel and form the so called 'choanoderm': the layer represents endoderm of a diploblastic poriferan organism. They also function as first digestion units as digestion in sponges is intracellular.Archaeocytes are totipotent cells which can differentiate into other cell types within the body of sponge. They are present along the spongocoel and the water canal system. They line up the internal chamber of sponges. These cells are flagellated and have a collar of protoplasm at the base of their flagellum. ![]() The flowing water brings microorganisms that can be entrapped by specialized catching cells of sponges. They rely on the constant flow of water to obtain food and to excrete. They do not have nervous, circulatory, or digestive systems. The pores and channels throughout their outer wall allow water and nutrients to circulate through them. The outer walls of the sponges surround the internal cavity. Flagellated cells that line the internal chamber of sponges are involved in catching food for sponges.Ĭomplete answer:Sponges are marine primitive animals that have cylindrical porous bodies. They have different types of cells for different functions. They have a porous body and cellular level of organization. Hint: Sponges are primitive organisms that belong to the phylum Porifera.
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