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Nervous System

Nervous System . A.P. Biology. Nervous System Fxns. Sensory input (Stimulus sent via Afferent fibers) Integration Motor output (Response sent via Efferent fibers). Functions: •    Sensory input – internal and external stimuli •    Integration – interpretation of sensory input

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Nervous System

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  1. Nervous System A.P. Biology

  2. Nervous System Fxns • Sensory input (Stimulus sent via Afferent fibers) • Integration • Motor output (Response sent via Efferent fibers)

  3. Functions: •    Sensory input – internal and external stimuli •    Integration – interpretation of sensory input •    Motor output – response

  4. CNS & PNS

  5. Neurons Structural units of the nervous system Composed of a body, axon, and dendrites Long-lived, a-mitotic, and have a high metabolic rate Their plasma membrane functions in electrical signaling

  6. Ganglion

  7. Nuclei vs ganglia • Clusters of cell bodies in the CNS are called nuclei • Clusters of cell bodies in the PNS are called ganglia

  8. Action potential

  9. K+ Na+ Ca++ Cl-

  10. Sodium – Potassium pump

  11. Scwann cells • Form myelin sheath of PNS

  12. Saltatory Conductionof a myelinated axon

  13. Ligand gated channel

  14. White matter vs gray matter • White matter is myelinated • Gray matter is unmyelinated • Dendrites are always unmyelinated

  15. Utricle and Saccule

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