Question

Exocytosis is responsible for which process(es)?

the fusion of vesicles from the rough endoplasmic reticulum into the Golgi apparatus

the activation of T-cells by the self-nonself complex

the differentiation of B-cells into memory cells

the destruction of pathogens by macrophages

the release of neurotransmitter from one nerve cell to another

Answer 1

Exocytosis is a kind of process in which the cell transports molecule out of the cell by secreting them. It is energy-dependent process, so we can say it is an active transport. Large amount of molecules are released in this process, so it is also a type of bulk transport. In exocytosis, membrane bound secretary vesicles are formed, this vesicle contains the transport molecules, then it fuses with the cell membrane to secrete the molecules outside the cell. Five steps involved in exocytosis: Vesicle trafficking, Vesicle tethering, Vesicle docking, Vesicle priming, Vesicle fusion.

The release of neurotransmitter from one nerve to another nerve is the example of exocytosis. Synaptic vesicle of one nerve contains the neurotransmitter, from which the neurotransmitter is released into the synaptic cleft via exocytosis.