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Nervous System:

Nervous System:. Central Nervous System: (The center of integration and control) 1. The brain 2. The spinal cord Peripheral Nervous System: The nervous system outside of the brain and spinal cord. Basic Nerve cell Structure: Neurons. Dendrites Cell body Axon Axon terminal.

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Nervous System:

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  1. Nervous System: • Central Nervous System: • (The center of integration and control) • 1. The brain • 2. The spinal cord • Peripheral Nervous System: • The nervous system outside of the brain and spinal cord

  2. Basic Nerve cell Structure: Neurons • Dendrites • Cell body • Axon • Axon terminal

  3. 3 main types of Neurons: sensory neuron motor neuron relay neuron

  4. Conduction of Nerve Impulses: Online animation

  5. Nerve impulses are conducted along the neuron

  6. Online video Online animation

  7. Resting Potential: Na/K Pump + -

  8. The Action Potential Activation gates of the Na+ channels are open, but the K+ channels remain closed. Na+ ions rush into the cell, and the interior of the cell becomes more positive. Na+ close and potassium channels open. K+ ions leave the cell and the loss of positive charge causes the inside of the cell to become more negative than the outside. A stimulus opens some Na+ channels. If the Na+ influx achieves threshold potential, then additional Na+ gates open, triggering an action potential. Na+ channels are closed, but the slower K+ remain open. Within a millisecond, the resting state is restored. Both Na+ & K+ channels are closed, and the membrane’s resting potential is maintained.

  9. Nerve impulse along a non-myelinated neuron animation

  10. Synaptic Transmission animation http://www.blackwellpublishing.com/matthews/nmj.html

  11. Synaptic Transmission animation

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