Exocytosis — Science definition
Bulk transport in which a vesicle fuses with the membrane to release its contents outside the cell.
Where it is taught
- Cellular Transport — Cells, Membranes & Exchange, Life Science: Biology, Grade 10
In use
In exocytosis, the reverse happens: a vesicle travels to the membrane, fuses with it, and dumps its contents outside — the route your cells use to release hormones, neurotransmitters, and digestive enzymes.
Cellular Transport
Questions using exocytosis
Problem 1
Explain the difference between endocytosis and exocytosis.
Answer and explanation
In endocytosis, the membrane wraps around material and pulls it into the cell inside a vesicle (bringing things in). In exocytosis, a vesicle fuses with the membrane and releases its contents outside the cell (sending things out). Both move large amounts of material and require energy.