EVERYDAY SCIENCE

Detailed explanation-1: -These are called choanocytes. They also function as first digestion units as digestion in sponges is intracellular. Let us discuss other types of cells that sponges consist of. Thesocytes are specialized cells that are used to store food.

Detailed explanation-2: -Choanocytes and archaeocytes The choanocytes are provided with a flagellum, which is surrounded by a collar composed of cytoplasm. The main function of the flagellum apparently is to produce the water current, that of the collar is to capture food particles.

Detailed explanation-3: -Choanocytes: These are also known as collar cells. They are the flagellated cells, which work as a digestive system in sponges. The collars comprise microvilli, which are used to filter excess water out of the body.

Detailed explanation-4: -The second function of choanocytes is to capture food particles. The water currents created by the flagellum bring food particles into the sponge cavity and the microvilli of the collar filter capture these small food particles. The particles are then pushed into the center of the cell where they are ingested.

Detailed explanation-5: -Choanocytes trap bacteria and other food particles from water flowing within the sponge: in through the ostia and out through the osculum; particles are ingested by phagocytosis.