Examlex
Your textbook defines social change as:
Neurotransmitter's Action
involves the process by which neurotransmitters, which are chemical messengers, are released by neurons to transmit signals across synapses to other neurons, muscles, or glands.
Antagonist
In pharmacology, a substance that acts against and blocks an action by attaching to and inhibiting the function of receptors in the body. In literature, a character who opposes the protagonist.
Agonist
A substance that fully activates the receptor that it binds to, producing a biological response.
Endorphins
Naturally occurring peptides in the brain that act as neurotransmitters, known to relieve pain and induce feelings of pleasure or euphoria.
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