PSYC 001 Chapter Notes - Chapter 3: Axon Terminal, Myelin, Resting Potential

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Glial cells: glue cells of myelin sheath. Neurons: nerve cells; receive, integrate, and transmit neurons. Sensory receptors in skin goes through affluent -> interneuron -> section of spinal cord -> efferent -> bicep muscles - muscle contracts. Right motor cortex controls right side of body. Frontal lobes go crazy when you first start to learn. you become an expert when they stop working a lot during activity. Due mostly to negatively charged proteins. (a-) 10x more sodium (na+) outside than inside membrane. Resting state of a neuronal membrane: negative charge inside; positive charge outside (polarized) Changes from other neurons accumulate in the neuron. Once charge become sufficiently positive (reaches threshold; depolarization), they change the permeability of the membrane, and an a. p. occurs as an all-or-none response. Action potential over time: resting: all channels closed, a. p. (action potential): sodium channels open (depolarization, novocane shut these sodium channels and thereby blocks action potential (numbing area)

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