Endocytosis and exocytosis:

Endocytosis and exocytosis are active procedures including bulk transport of materials via membranes, either into cells (that is, endocytosis) or out of cells (that is, exocytosis).

Endocytosis takes place by an in folding or extension of the plasma membrane to form a vacuole or vesicle. It is of two kinds:

1. Phagocytosis: (cell eating)

Substances are taken in solid form. The cells including this procedure are termed as phagocytes and said to be phagocytic. Example: some white blood cells. A phagocytic vacuole is build during the uptake.

2. Pinocytosis (cell drinking):

Substances are taken in liquid form. The vesicles that are very small are formed during intake. Pinocytosis is frequently related with amoeboid protozoans, and in some kidney cells included in fluid exchange. It can also take place in plant cells. Exocytosis is the overturn of endocytosis by which materials are eliminated from cells like undigested stays from food vacuoles.

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