Endocytosis & Exocytosis

Endocytosis & Exocytosis

1. Endocytosis

Cell takes contents in (i.e.., from ECF to cytoplasm).


On contact with large molecule, cell membrane invaginates forming vesicle, including macromolecule.

Vesicle is pinched within cell & restoring cell membrane.

Requires energy, Ca++ & contractile elements in cell.

2. Exocytosis/endocytosis/reverse pinocytosis:

Reverse of endocytosis.

Process of extrusion of secretory granules from cell.

On contact of secretory vesicle with cell membrane, vesicular fusing & subsequent vesicular content extrusion takes place à Extruded as secretory granules.

Requires energy, Ca+.

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