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process by which cells absorb external substances

Cellular uptake refers to the process by which cells absorb substances such as nutrients, hormones, and drugs from their surrounding environment. This can occur through various mechanisms like endocytosis, where the cell membrane engulfs the substance, or through transport proteins that facilitate the movement of molecules across the cell membrane. Understanding cellular uptake is crucial for fields like pharmacology and medicine, as it influences how effectively a drug can enter and act within a cell.

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