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Nervous System Overview and Action Potentials

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Created December 9, 2025

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Video Transcript

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Student: How is the nervous system organized? Tutor: CNS: brain + spinal cord →

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integration. PNS: nerves → connect CNS and body. Sensory (afferent): to CNS (somatic

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= skin/muscles, visceral = organs) Motor (efferent): from CNS (somatic = voluntary,

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autonomic = involuntary) Student: Neuroglia? Tutor: CNS: astrocytes (support, BBB),

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oligodendrocytes (myelinate), microglia (immune), ependymal (CSF). PNS: Schwann (myelinate),

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satellite (support). Student: Membrane potential basics? Tutor: Resting ~–70 mV,

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inside negative. Na⁺ low inside, K⁺ high inside. Voltage-gated → AP

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Chemically-gated → graded potentials Mechanically-gated → physical stimuli Student: Graded

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