BISC 101 Lecture Notes - Lecture 16: Myelin, Membrane Potential, Nerve Net
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29 Mar 2016
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The nervous system is involved in physiological regulation (control) of many systems and in sensory input and motor output. Sensor (receives stimulus) -> sensory input -> integration -> motor output -> effector. The neuron is the function unit of the nervous system. Supporting cells that provide support and insulation to aid in transmission of impulse. Increases distance over which cell can transmit = need fewer cells. The nature of the nervous signal is potential energy. Conformational change of the na-k atpase protein drives ion flux. Active transport of na and k, and selectively permeable nature of membrane result in a. Cell processes which convey signals to the cell body. Action potential is information traveling along a neuron. Conduction of action potential (=information) along a neuron. Bisc 101 - animals page 2 i. ii. iii. Na+ inflows generates action potential at one point on membrane. Depolarisation spreads to neighbouring part of membrane, sufficient to depolarise above threshold.
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