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How do sponges digest food?
Sponges don't actually have distinct resipratory, circulation, digestive or excretory systems. To feed, they filter out food particles from the water which flows through them. The particles go into the Osteia (pores) and are internally digested by Pinacocytes or Archaeocyte which partially push themselves through the wall of the Osteia. However, bacteria-sized particles - which constitute around 85% of the sponges diet - which are too small to be consumbed by the Pinacocytes or Archaeocyte pass through the Osteia and are caught by the Choanocytes. The Archaeocytes then transport the food in vesicles away from the cells which directly digest food to those which do not.
Do sponges digest?
Sponges don't actually have distinct resipratory, circulation, digestive or excretory systems. To feed, they filter out food particles from the water which flows through them. The particles go into the Osteia (pores) and are internally digested by Pinacocytes or Archaeocyte which partially push themselves through the wall of the Osteia. However, bacteria-sized particles - which constitute around 85% of the sponges diet - which are too small to be consumbed by the Pinacocytes or Archaeocyte pass through the Osteia and are caught by the Choanocytes. The Archaeocytes then transport the food in vesicles away from the cells which directly digest food to those which do not.
