Nervous System

Nervous System: controls involuntary and voluntary movement made up of Central Nervous System and Peripheral Nervous System.

  • Nerve cells>neurons
    • Cell body: soma
    • Dendrites: receives impulses
    • Axons: carries impulses away
  • Synapse: region surrounding the point of contact between 2 neurons or a neuron and its effector organ
  • Sensory nerves: transmits back to brain
  • Motor nerves: transmits toward muscles

Nerve impulses are carried by changing the electrical charge of each cell. Sodium, potassium and calcium ions move in and out of the cells, changing their charge.

  • Resting state: polarized
  • Nerve impulse hits: depolarized
  • Impulse moves on: repolarized


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