35.2 The Nervous System<br />
Neuron<br />Cell that carries messages throughout the nervous system.<br />
Cell Body <br />Largest  part of a typical neuron; contains the nucleus and much of the cytoplasm. <br />
Dendrite<br />Extension of the cell body of a neuron that carries impulses from the environment or from other neurons towa...
Axon<br />Long fiber that carries impulses away from the cell body of a neuron.<br />
Myelin Sheath<br />Insulating membrane surrounding the axon in some neurons.<br />
Resting Potential <br />Electrical charge across the cell membrane of a resting neuron.<br />
Action Potential <br />Reversal of charges across the cell membrane of a neuron; also called a nerve impulse.<br />
Threshold <br />Minimum level of a stimulus required to activate a neuron<br />
Synapse <br />Location at which a neuron can transfer an impulse to another cell.<br />
Neurotransmitter <br />Chemical used by a neuron to transmit an impulse across a synapse to another cell.<br />
Key Concept<br />The nervous system controls and coordinates functions throughout the body and responds to internal and ex...
Key Concept<br />An impulse begins when a neuron is stimulated by another neuron or by the environment.<br />
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Biology 35.2

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Biology 35.2

  1. 1. 35.2 The Nervous System<br />
  2. 2. Neuron<br />Cell that carries messages throughout the nervous system.<br />
  3. 3. Cell Body <br />Largest part of a typical neuron; contains the nucleus and much of the cytoplasm. <br />
  4. 4. Dendrite<br />Extension of the cell body of a neuron that carries impulses from the environment or from other neurons toward the cell body.<br />
  5. 5. Axon<br />Long fiber that carries impulses away from the cell body of a neuron.<br />
  6. 6. Myelin Sheath<br />Insulating membrane surrounding the axon in some neurons.<br />
  7. 7. Resting Potential <br />Electrical charge across the cell membrane of a resting neuron.<br />
  8. 8. Action Potential <br />Reversal of charges across the cell membrane of a neuron; also called a nerve impulse.<br />
  9. 9. Threshold <br />Minimum level of a stimulus required to activate a neuron<br />
  10. 10. Synapse <br />Location at which a neuron can transfer an impulse to another cell.<br />
  11. 11. Neurotransmitter <br />Chemical used by a neuron to transmit an impulse across a synapse to another cell.<br />
  12. 12. Key Concept<br />The nervous system controls and coordinates functions throughout the body and responds to internal and external stimuli.<br />
  13. 13. Key Concept<br />An impulse begins when a neuron is stimulated by another neuron or by the environment.<br />

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