Examlex
Describe the properties of space in the vicinity of a black hole.
Agonist
A chemical or drug that binds to receptors in the brain and activates them to produce a biological response.
Neurotransmitter
Chemical messengers that transmit signals across a chemical synapse from one neuron to another 'target' neuron, muscle cell, or gland cell.
Endogenous
Originating from within an organism, tissue, or cell, used to describe processes or substances that are internally generated.
Naturally Occurring
Referring to substances, phenomena, or processes that exist or happen without human intervention.
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