APA 2134 Chapter 3: Chapter 3 readings - Exercise Physiology
15 Oct 2018
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Structure and function of the nervous system: neuron: basic structural unit of the nervous system. Neuron: composed of: cell body (soma)- contains the nucleus, dendrites-radiates. 70mv, closer to zero, normally resulting in a change in na permeability. Propagation of the action potential: myelination and diameter of the neuron determine how quickly the impulse can pass along. If you have ms you experience degeneration of the myelin sheets and loss of coordination. Diameter of a neuron: larger diameter can conduct impulses faster than a smaller diameter because larger neurons present less resistance to local current flow. Individual neurons are grouped/bunched and in the cns these are called tracts/pathways : neuron bundles in the pns are refereed to as nerves . Central nervous system: cns is comprosed of 100 billion neurons. Brain: four divisions: cerebrum, diencephalon, cerebellum and brain stem. Basal ganglia: found in the cerebral white matter deep in the cortex, clusters of nerve cell bodies.
