Pinocytosis, or "cell drinking," refers to the process of a cell engulfing a large, solid particle and bringing it into the contents of the cell.

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Pinocytosis is actually the process of a cell taking in small droplets of extracellular fluid, rather than large solid particles. This is a form of endocytosis where the cell membrane invaginates and then closes, bringing in the droplet of fluid.

Pinocytosis, or "Cell Drinking," Refers to the Process of a Cell