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Lecture 2 1-09-08

Lecture 2 1-09-08 - I Nerve Tissue a Cell Types i Neurons...

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I. Nerve Tissue a. Cell Types i. Neurons: more than 10 11 in primates 1. generate electrical signaling ii. Glia: a magnitude more # of neurons! P 1. provide insulation 2. provide nutrition 3. affect signaling b. Neuronal Morphology i. The dendrites receives the synapses ii. Make synapses on the axon terminals iii. (Fig. 48.5) 1. Axon provides insulation 2. Axon hillock is where a special signals sart and travel down the axons c. Electrical Signals i. Action Potentials (APs)-conduct over long distance ii. Postsynaptic Potentials (PSPs)-local events that occur at synapses iii. Generator Potentials (GPs)-very specific; local signals but found ONLY in sensory neurons 1. Sensory neurons convert a physical stimulus into an electrical signal that the nervous system can recognize and use d. Types of Connections (synapses) i. Cell Type : [Sensory Neuron] [Inter Neurons] n [Motor Neuron]s [Effector Cells] (muscle cell; gland secrete) ii. Purpose : Detect sensation Process Info Issue command carry out commands iii. Signal : [GP
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