Examlex
Standard used by the courts to determine whether speech may be restricted; only speech that creates a serious and immediate danger to society may be restricted.
Chemical Messenger
A substance, such as a hormone or neurotransmitter, that transmits signals from one cell to another.
Neurotransmitter
Chemicals released by neurons to transmit signals across a synapse to another neuron, muscle cell, or gland.
Calcium Channel
Calcium channels are protein-based channels within cell membranes that selectively allow calcium ions to move into or out of a cell, playing critical roles in various physiological processes including muscle contraction, neurotransmission, and gene expression.
Myelin Sheath
A fatty layer that surrounds nerve fibers, providing insulation and increasing the speed of electrical transmission along the neuron.
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