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NERVOUS SYSTEM

NERVOUS SYSTEM. General Function. Neuron Structure. Membrane Potential. Difference in charge across membrane Resting Potential Potential of unstimulated neuron (-70mV). Membrane Potential. Open channels change the potential Amplitude depends on strength of stimulus.

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NERVOUS SYSTEM

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  1. NERVOUS SYSTEM

  2. General Function

  3. Neuron Structure

  4. Membrane Potential • Difference in charge across membrane • Resting Potential • Potential of unstimulated neuron (-70mV)

  5. Membrane Potential • Open channels change the potential • Amplitude depends on strength of stimulus

  6. Effect on Membrane Potential?

  7. Synapses • Action Potential  Release of neurotransmitters • Channels open in postsynaptic membrane

  8. Neurotransmitters • NT’s may be • Excitatory (Stimulatory) • Depolarization • Cause AP in next neuron • or Inhibitory • Hyperpolarization • AP is more difficult • Closer to hillock  stronger effect

  9. Summation

  10. Peripheral Nervous System CNS  Effector Cells Sensory receptors  CNS Control internal environ Control external environ

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