Today’s TopicNeurons

BumpyBulbousBranched

DENDRITES

Stubby

Mushroom

Thin

3 Common Dendritic Spines

Soma

Lots of sodium outside

+ -

Lots of potassium inside

At Rest

1+ charge each

as each gate opens the next is triggered

as each gate opens the next is triggered

neurotransmitteris released

Neurotransmitter binds to receptorCauses some sodium channels to open

++Ligand-gated channel opensNT+

-++

Sodium ions enter

Cell is more positive

Soma-

NT- 55

Voltage-gated channels open as cell voltage reaches threshold

Voltage-gated channels open as cell voltage reaches threshold

Dr. Ken Tangen

www.BiologicalPsych.com