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IMG_NEW_0013_001 - -f o Lecture 8 Nervous system Formation...

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--f _ Lecture 8: Nervous system o 1. The nervous system is involved in physiological regulation (control). of many systems and in sensory input and motor output. The nervous system has two major functions: 1) controls responses to the external environment 2) maintains homeoptasis by coordinating internal qrt&W' 2. The.flEtKll* is the functional unit of the nervous system. Neuron: large cell body (usually located in CNS). fdh Fffilare cel processes which convey signals to the cell boOy. Foillonduct impulses away from the cell body. ! supporring ,"rrffi,ide support and rnp|i#rato aid ffinsmission of '.f#"j Functional importance of this shape: increase distance over which cell can transmit, i.e. need fewer cells. (Fig. a8.a) 3. The nature of the nervous signal is potentialenergy . ion concentrations inside and outside neuron differ . concentration gradients exist across the membrane . selectively permeable membrane, K* >>>Na* . concentration gradients are maintained b by Na*-K* pumps Formation of resting membrane potential - role of
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