Question

what is cytostome ? mention it's function​

Answer 1

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A cytostome (from cyto-, cell and stome-, mouth) or cell mouth is a part of a cell specialized for phagocytosis, usually in the form of a microtubule-supported funnel or groove Only certain groups of protozoa, such as the Ciliophora and Excavata, have cytostomes.

Answer 2

The cytostome is a plasma membrane invagination coupled to a few special microtubules that penetrate the cell almost to the nucleus.

Function

The cytostome-cytopharynx complex functions as follows: macromolecules to be taken up by a cell enter the cytostome. Macromolecules then pass into the lumen of the cytopharynx and are transported to the posterior end of the cell where they are put into budding vesicles that are transported to others parts of the cell. The cytopharynx in this way acts much like a straw that sucks macromolecules to the posterior end of the cell. The passage of macromolecules from the entrance of the cytostome to the posterior end of the cytopharynx takes at least 2 minutes.