This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neurotransmitters, Subject name: Physiology
Release of neurotransmitter from presynaptic vesicles is an example of - 
Select and explain. 
A. Simple diffusion, B. Facilitated diffusion, C. Active transport, D. Exocytosis
D: Exocytosis
Answer: D: Exocytosis 
Explanation: Ans. is 'd' i.e., Exocytosis o Release of neurotransmitter from presynaptic vesicle occurs by exocytosis.o Macromolecules like neurotransmitters can not pass through the cell membrane by diffusion or active transporto They are transported out of the cells by exocytosis, in which neurotransmitter is first packed into vesicle (synaptic vesicle) and then released by exocytosis.