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What is the difference between a chain drive and a belt drive system?
Receptor Sites
Specific regions on the surface of a cell where molecules such as neurotransmitters can bind to initiate a cellular response.
Agonist
A substance that fully activates the receptor it binds to, producing a full biological response.
Antagonist
In physiology, a muscle that acts in opposition to the action of another muscle, called the agonist; in pharmacology, a substance that inhibits the action of another substance.
Neuromodulator
A neuromodulator is a substance in the nervous system that modifies the functions of neurons, influencing how signals are transmitted across synapses.
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