Examlex
Programs that teach abstinence-only and do not teach contraception
First Messenger
A signaling molecule that binds to a receptor on the cell surface, initiating a signal transduction process that leads to the formation of an intracellular second messenger.
Ion Channel
An ion channel is a protein structure embedded in cell membranes that allows ions to pass through the membrane selectively.
Ligand
A molecule that binds specifically to another molecule, usually a larger one, in a reversible manner.
Acetylcholine
A common neurotransmitter released by cholinergic neurons, including motor neurons.
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