The nervous system

1
The nervous system
2
Parts of a nerve cell

• Soma- nerve cell body
• Dendrite- receives information from other nerve
  cells
• Axon- sends information to other nerves or
  muscles
• Axon hillock- area of axon with lowest threshold

3
Stimuli type

• Chemical- taste or smell
• Electrical- light socket
• Mechanical- touch

4
Threshold level

• Level at which nerve is stimulated enough for
  depolarization to occur
• All or none phenomenon

Stimulation level
Threshold level
5
Potential energy diagram

• Shows how much energy is inside relative to
  outside a cell and the change over time with Na
  influx

depolarization
repolarization
-80mV