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Nervous System and Active Transport

Nervous System and Active Transport. Big Ideas: #2 (Homeostasis) & #4 (Interactions). Basic Organization of the Nervous System. Organization of the Brain. Nervous Tissue. Functional Unit: Neuron. Communication Sequence. Potential in a neuron. What allows for the potential difference?.

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Nervous System and Active Transport

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  1. Nervous System and Active Transport Big Ideas: #2 (Homeostasis) & #4 (Interactions)

  2. Basic Organization of the Nervous System

  3. Organization of the Brain

  4. Nervous Tissue

  5. Functional Unit: Neuron

  6. Communication Sequence

  7. Potential in a neuron

  8. What allows for the potential difference? The sodium potassium pump uses ATP to maintain a charge differential inside and outside the neuron

  9. Mechanism for the Sodium Potassium Exchange Pump • Active Transport • Requires ATP • Movement against the concentration gradient.

  10. Role of facilitated diffusion Movement of ions through gated channels is “down the concentration gradient” or passive

  11. Action potential: The change in charge that propagates down a nerve cell and allows signals to travel over long distances. • Watch the action potential animation. • http://outreach.mcb.harvard.edu/animations/actionpotential_short.swf • While you are watching the animation, draw a nerve impulse and identify the changes that cause the impulse to occur.

  12. Action potential graph:

  13. Propagation down an axon

  14. Channels are concentrated in nodes of Ranvier

  15. What happens when the signal gets to the end? • Signal must cross a space (synapse) between: • 2 neurons • A neuron and a muscle cell • Signal changes: • ElectricalChemicalElectrical

  16. To prepare for the next lecture: • Sketch and label a drawing of a basic nerve synapse.

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