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Why was the Underground Railroad such a thorn in the side of the South,even though the number of escaped slaves it aided was relatively small? Why have the Underground Railroad and its most famous "conductor," Harriet Tubman,become such familiar historical names to Americans in recent decades?
Neurofibrils
Fine, thread-like structures within nerve cells that provide support and conduct electrical signals throughout the neuron.
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.
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