Biology / Unit 2 Bio 0376 short lesson, about 20 seconds
Exocytosis
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The idea
Exocytosis is active transport that expels material from a cell by fusing a membrane-bound vesicle with the plasma membrane and releasing its contents outward.
In practice
A neuron releases neurotransmitter into the synaptic cleft by exocytosis, fusing synaptic vesicles with its plasma membrane.
Where people slip
Exocytosis and endocytosis move membrane material in opposite directions, but both spend cellular energy as active transport.
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