________ are biochemical substances that are released into the synaptic cleft to stimulate or suppress other neurons.

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Neurotransmitters are the biochemical substances that are released into the synaptic cleft to stimulate or suppress other neurons. Receptors are proteins on the surface of cells that receive signals from neurotransmitters, hormones, or other molecules. Hormones are signaling molecules produced by glands in the endocrine system that are released into the bloodstream to affect target cells. Interneurons are neurons that transmit signals between other neurons. Neurohormones are hormones that are produced by neurons and released into the bloodstream.

________ Are Biochemical Substances That Are Released into the Synaptic