Nervous System

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Nervous System A.P. Biology

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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 - PowerPoint PPT Presentation

Transcript of Nervous System

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Nervous System

A.P. Biology

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Nervous System Fxns• Sensory input (Stimulus sent via Afferent

fibers)

• Integration

• Motor output (Response sent via Efferent fibers)

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Functions:

•    Sensory input – internal and external stimuli

•    Integration – interpretation of sensory input

•    Motor output – response

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CNS & PNS

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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

Neurons

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Ganglion

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Nuclei vs ganglia• Clusters of cell bodies in the CNS are

called nuclei

• Clusters of cell bodies in the PNS are called ganglia

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Action potential

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K+

Na+

Ca+

+

Cl-

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Sodium – Potassium pump

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Scwann cells• Form myelin sheath of PNS

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Saltatory Conductionof a myelinated axon

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Ligand gated channel

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White matter vs gray matter• White matter is myelinated

• Gray matter is unmyelinated

• Dendrites are always unmyelinated

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Utricle and Saccule

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