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Myelin
A fatty substance that wraps around neurons, increasing the speed at which electrical impulses are passed along the nerve cells.
Neurotransmitters
Chemicals that transmit signals across a synapse from one neuron to another in the brain and nervous system.
Endorphins
Natural pain-relieving and pleasure-inducing chemicals produced by the brain in response to stress, pain, or exercise, often associated with feelings of euphoria.
Selectively Permeable
Selectively permeable refers to a membrane or barrier that allows certain substances to pass through while blocking others, commonly used in biological contexts.
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