1. NERVE IMPULSE

2. An electric message sent on neurons. 4 stages of sending message.
NERVE IMPULSE
An electric message sent on neurons. 4 stages of sending message.

3. STEP 1
Resting potential: -70 mV (millivolts) difference between inside and outside.
Na+ ions outside
K+ and Proteins inside.

4. Action potential: Membrane stimulated Na+ gates open (come in)
STEP 2
Action potential: Membrane stimulated
Na+ gates open (come in)
Depolarization (+30 mV)

5. K+ ions gates open (go out) Returns to -70 mV
Step 3
Repolarization:
K+ ions gates open (go out)
Returns to -70 mV

6. Na/K pumps use ATP (energy) to pump back to original places.
Step 4
Recovery:
Na/K pumps use ATP (energy) to pump back to original places.
Shuts down until complete!

10. The nerve impulse travels like a wave. 2 different methods.
CONDUCTION
The nerve impulse travels like a wave.
2 different methods.

11. Myelinated: impulse jumps from node to node. FASTER (100-200m/sec)
CONDUCTION
Myelinated: impulse jumps from node to node. FASTER ( m/sec)

12. UN-myelinated: impulse goes from point to point. SLOWER (1m/sec)
CONDUCTION
UN-myelinated: impulse goes from point to point. SLOWER (1m/sec)

13. Look at your textbook example on page: 223