Dr. Ken Tangen gives a quick overview of neurons, including their anatomy and stages of an action potential.

1. Today’s Topic
Neurons

4. Bumpy
Bulbous
Branched
DENDRITES

5. Stubby
Mushroom
Thin
3 Common Dendritic Spines

8. Soma
Lots of sodium outside
+ -
Lots of potassium inside
At Rest
1+ charge each

11. as each gate opens
the next is triggered

12. as each gate opens
the next is triggered
neurotransmitter
is released

14. Neurotransmitter binds to receptor
Causes some sodium channels to open

15. ++
Ligand-gated channel opensNT
+
-+
+
Sodium ions enter
Cell is more positive

20. Soma
-
NT
- 55
Voltage-gated channels open
as cell voltage reaches threshold

21. Voltage-gated channels open
as cell voltage reaches threshold

29. Dr. Ken Tangen
www.BiologicalPsych.com