How unicellular organisms absorb and how to digest food.

Eating is carried out by pinocytosis and phagocytosis. Pinocytosis or “cell drinking” is the absorption of fluid; phagocytosis, or “cell swallowing,” is the capture of solid shaped particles.
With phagocytosis, the cell membrane forms an indentation inside, which then, when laced up, create vesicles (phagocytosis vacuoles) with food enclosed inside. After this, the phagocytotic vacuole merges with the primary lysosome, filled with digestive enzymes with an acid reaction. This forms a secondary lysosome, or digestive vacuole, which carries out the digestion of food particles.
With the help of special methods of staining cells, one can observe how gradually, in the process of splitting food particles, the acidic content of digestive vacuoles changes to neutral. Nutrients are absorbed by the cell. After the end of the process, an undigested portion of the food remains in the membrane vesicle. The residual body is embedded in the outer cell membrane and pushes its contents out (a process similar to phagocytosis, but occurring in the opposite direction).

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