![]() ![]() Water entering the spongocoel is extruded via a large common opening called the osculum. Water can enter into the spongocoel from numerous pores in the body wall. Like carbonic acid and other nitrogenous waste, The canal system does the sameįunctions as the excretory system in higher animals.The morphology of the simplest sponges takes the shape of a cylinder with a large central cavity, the spongocoel, occupying the inside of the cylinder. Outgoing water, which passes outside the osculum remove the excretory products The respiration is intracellular. The canal system does the same functions as the respiratory system in higher animals. Oxygen is taken in by the simple process of diffusion and carbon-dioxide is given out. The ingressed water has dissolved air, therefore, gaseous exchange or respiration takes place in the cells. The canal system does the same functions as the The food is ingested into the cell’s protoplasm and digested. diatoms, protozoa and particles of organic debris are absorbed in Robert Grant observed that along with ingressed water smaller food-particlesĮ.g. Water flows into the central cavity or spongocoel. The canal system acts as a path for theįood through the body cells. Such a distribution of pressure is set up when each flagellum causes a flow of water towards the centre of the chamber. But as the pressure in the incurrent and excurrent canals is the same.īut the pressure at the periphery of the cavity should be less but at the opening (osculum) it should be more. For escaping water through osculum The pressure within cavity must be higher than that in the excurrent canals. For entering water through dermal ostia into the body there must be a pressure inside the central cavity must be less than that in the incurrent canals. ![]() There are two conditions of incurrent and excurrent. ![]()
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