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Endocytosis and Exocytosis
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Endocytosis and Exocytosis

Endocytosis and Exocytosis

Author: Nathan Lampson
Description:

This lesson introduces the processes of endocytosis and exocytosis, both processes which move larger molecules in and out of the cell, by way of vacuoles.

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Endocytosis

A cell takes in large molecules by forming a vesicle.  Vesicles and vacuoles created during endocytosis are composed of plasma membrane.  Endocytosis is a form of active transport because it requires energy in the form of ATP in order to occur.

Exocytosis

In exocytosis, the cell exports bulky materials by containing them in a vesicle and expelling them through the cell membrane.  Exocytosis is the reverse process of endocytosis.

Example:

When humans cry, exocytosis is used to expel a salty solution containing proteins.

Source: Concepts in Biology Twelfth Edition Eldon Enger, et al.

Endocytosis and Exocytosis