01:119:116 Lecture Notes - Lecture 18: Voltmeter, White Matter, Schwann Cell

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Information processing (3 stages: types of neurons, sensory- afferent neurons, sensory receptor nervous system. Integration - interneurons- only interact with other neurons: 90% of neurons, motor-efferent neurons, nervous system effector (muscle, etc) Membrane potential (mp)- potential to do work: all animal cells. Components of nervous system brain, spinal cord, sensory receptors, nerves. Introduction: selectively permeable membrane, polarized- difference in charge on either side, outside more + Inside more : excitable cells, cells that can rapidly change membrane potential, neurons, muscle cells, voltage, measurement of membrane potential, measured by voltmeter, resting potential, mp of cell at rest (not excited) 60 --- -80 mv (-70 mv: na/k pump b) Changes to membrane potential: hyperpolarization- becomes more negative, depolarization- becomes more positive (closer to 0, graded potentials- shift in mp- stimulus determines strength. 1: threshold-mp required to trigger action potential. Action potential (ap) - electrical signals within neuron a) 55 mv for most neurons: mp crosses threshold.

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