Sponges have specialized cells with flagella that move water through the sponges that are called2/22/2024 Porifera fact: Many sponges can filter their entire body volume in less than one minute. Organized as an assemblage of different kinds of specialized cells.Other specialized cells in the sponge carry out the processes of growth, repair, nourishment, or reproduction. Collagen is a protein found in all animals that helps hold cells together and is a component of the skeletal system. Some of these cells secrete a supporting skeleton of collagen fibers or mineral spicules (glass or calcium carbonate). The body of the sponge between this system of canals is a loose assemblage of about six different types of specialized cells. This type of feeding is called filter feeding. Food particles are taken in and digested inside the sponge's cells and the nutrients shared. On each collar cell a flagellum is surrounded by a ring- like a comb or collar the beating of the flagellum draws water through the comb, where tiny particles are caught and carried down to the body of the cell to be digested. The channels lead to inner chambers lined with specialized feeding cells called a choanocytes or collar cells. The small pores are the entrances to a complex system of channels through which the sponge pumps a current of water from which its cells extract tiny particles of food. This skin is penetrated by numerous small pores and a few large openings. The surface of the sponge’s body is covered by a skin, one cell thick. The name porifera means ‘pore bearer’ in Latin. They are multicellular but do not have tissues or organs. Sponges are considered the oldest animal phyla.
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