Neuron Physiology

1
Neuron Physiology

• pp. 231-233

2
Properties of a Neuron

• Irritability respond to
• Stimulus
• Neurotransmitter
• Conductivity changes in
• Movement of ions (Na K)
• Polarized/depolarized depends on
• Ion channels (open or closed?)
• Na / K pump (requires ATP)
• Animation

3
Polarized

• At rest (irritable)
• Animation

4
Depolarization

• Generates action potential
• Animation

5
Repolarization

• Not irritable
• Animation

6
Return to Resting State

• Not irritable
• Animation Why one direction?

7

• Role of myelin
• Saltatory conduction
• Animation
• At the synapse?

8

• Animation

9
Types of Neurotransmitters

• Excitatory
• Inhibitory
• Examples
• Acetylcholine
• Norepinephrine
• Dopamine
• Serotonin
• Endorphins

10

1. Period during which the neuron cannot respond to
   a second stimulus.
2. State in which the resting potential is reversed
   as sodium ions rush into the neuron.
3. Electrical condition of the cell membrane of a
   resting neuron.
4. Period during which potassium ions diffuse out of
   the neuron.
5. Transmission of the depolarization wave along the
   neurons membrane.
6. The chief positive intracellular ion in a resting
   neuron.
7. Process by which ATP is used to move sodium ions
   out of the cell and potassium ions back into the
   cell completely restores the resting conditions
   of the neuron.
8. Process by which an action potential moves
   quickly along a myelinated axon.