Biology / Bio 0763 · Atom · ~20 seconds
Ligands and Receptors
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A ligand is a signaling molecule released by one cell that binds a specific receptor protein on or in a target cell, the cell the signal affects.
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A hormone circulating in the bloodstream is a ligand; it affects only cells carrying its matching receptor.
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A ligand affects only receptor-bearing cells — release does not affect every cell it reaches.