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Chapter 5
Chemical Messengers
4
Physiology
Undergraduate 1
10/19/2011
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Term
receptor
 Definition
protein on a target cell that recognize and bind a chemical messenger
Term
ligand
 Definition
a molecule that binds to another (usually larger) molecule
Term
affinity
 Definition
a measure of how tightly ligand molecules bind to proteins
Term
signal transduction
 Definition
the process by which the binding of a chemical messenger to receptors brings about a response in a target cell
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