AP BIOLOGY

Detailed explanation-1: -Exocytosis describes the process of vesicles fusing with the plasma membrane and releasing their contents to the outside of the cell, as s hown in Figure below. Exocytosis occurs when a cell produces substances for export, such as a protein, or when the cell is getting rid of a waste product or a toxin.

Detailed explanation-2: -A large particle, however, cannot pass through the membrane, even with energy supplied by the cell. There are two primary mechanisms that transport these large particles: endocytosis and exocytosis.

Detailed explanation-3: -Endocytosis. Endocytosis (endo = internal, cytosis = transport mechanism) is a general term for the various types of active transport that move particles into a cell by enclosing them in a vesicle made out of plasma membrane.

Detailed explanation-4: -The steps of exocytosis The vesicle fuses to the plasma membrane, during which the two bilayers merge. The vesicle’s contents are released into the extracellular space.

Detailed explanation-5: -Exocytosis is a form of bulk transport during which large numbers of molecules are transported out of the cell. In exocytosis, a vesicle (a small, membrane-bound compartment) containing the molecules to be released fuses with the cell membrane, and the contents of the vesicle are expelled.