Biology / Bio 0376 · Atom · ~20 seconds
Exocytosis
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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.
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A neuron releases neurotransmitter into the synaptic cleft by exocytosis, fusing synaptic vesicles with its plasma membrane.
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Exocytosis and endocytosis move membrane material in opposite directions, but both spend cellular energy as active transport.
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