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Pinocytosis

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Pinocytosis is the endocytosis variant taking in extracellular fluid and its dissolved small molecules, producing a much smaller vesicle than phagocytosis.

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A cell continuously sampling its surrounding fluid for nutrients uses pinocytosis rather than phagocytosis, since no large particle is engulfed.

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Despite its name, pinocytosis is not purposeful drinking — it takes in whatever small molecules are nearby.

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