Who am I

1
Who am I ???

• I am
• short-lived, that is - Im local

2
Who am I ???

• I spread down the whole axon

3
Who am I ???

• Depolarization or hyperpolarization, and
  repolarization

4
Who am I ???

• Only depolarization and repolarization are
  involved

5
Who am I ???

• I cause local depolarization (or local
  hyperpolarization),
• and how much of an area that is depolarized
  depends on the strength of the stimulus.

6
Who am I ???

• We add up to produce a generator potential at the
  axon hillock

7
Who am I ???

• Once the generator potential (-55mV) is reached
  at the axon hillock, we follow the all or none
  law.

8
Who am I ???

• I am decremental

9
Who am I ???

• Chemically-gated Sodium Channels are involved

10
Who am I ???

• Voltage-gated Sodium Channels are involved.

11
Who am I ???

• I cause the voltage to change from
• -55 mV to 35 mV

12
Who am I ???

• Im also called a nerve impulse.

13
Who am I ???

• I occur across the plasma membrane of dendrites
  and the cell body.

14
Who am I ???

• I occur ONLY across the plasma membrane of the
  axon.