Exocytosis

Definition

Exocytosis is a process where cells expel materials in vesicles by fusing them with the plasma membrane. This is essential for removing waste and releasing cellular products.

5 Must Know Facts For Your Next Test

1. Exocytosis is an active transport mechanism requiring energy in the form of ATP.
2. Vesicles involved in exocytosis are typically formed in the Golgi apparatus.
3. Exocytosis plays a crucial role in neurotransmitter release at synapses.
4. There are two types of exocytosis: constitutive (constant) and regulated (triggered by specific signals).
5. The process is integral for maintaining cell membrane integrity and size.

Review Questions

• What type of energy is required for exocytosis?
• Where are vesicles involved in exocytosis commonly formed?
• What role does exocytosis play at synaptic junctions?

Related terms

Endocytosis:

A process where cells ingest external materials by enveloping them in plasma membrane to form vesicles.

Vesicle: A small, membrane-bound sac that transports substances within or between cells.

Golgi Apparatus: An organelle responsible for modifying, sorting, and packaging proteins and lipids into vesicles for targeted destinations.