Examlex
Find the sum of the infinite geometric series.
Radioactive Tracer
A substance containing a radioisotope used to track or trace chemical reactions or biological processes by detecting the radiation it emits.
Neurons
Basic cells of the nervous system that transmit electrical and chemical signals throughout the body.
Neurotransmitters
Chemicals in the nervous system that transmit signals across a synapse from one neuron to another.
Agonists
Substances that activate receptors to produce a biological response.
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