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BIOL 1175 (37)
H.Hun (24)
Lecture

Neurons.docx

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Department
Biology
Course
BIOL 1175
Professor
H.Hun
Semester
Fall

Description
Neurons Composition of a Neuron  Dendrite  Cell body  Axon o Axon is covered in myelin sheath o [ ]=[ ]=[ ] spaces between is called nodes of ranvier o Saltatory conduction 3 Types of Neurons  Sensory: Signal go to CNS  Interneuron: Process signals  Motor neurons: Takes impulse from CNS Nerve Impulse Na* + + + + + + - - - - Plasma membrane K+ - - (inside) - - - - - - - (outside) 1) Resting Potenntial  Na+ on the outside while K+ on the inside 2) Action Potential  Sodium channels opening and Na+ goes in 3) Depolarization  many Na+ goes in 4) Repolarization  K+ flows out to balance
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