Nerve Transmission Steps (15)

1

Neuron is at resting potential (-70 mv)

2

Neurotransmitter binds to receptors on dendrite (chemical to electrical)

3

Binding creates graded potential which is sent to axon hillock for summation

4

If summation reaches action potential (-55 mv) then action potential is sent

5

Sodium ion channels open and sodium rushes in

6

Depolarization occurs

7

Sodium channels close and potassium channels open

8

Potassium rushes out

9

re polarization occurs

10

potassium channels are slower than sodium and membrane goes more negative (hyperpolarization)

11

Action potential is transmitted down the axon to the axon terminal

12

Calcium channels open and calcium rushes in

13

Calcium causes synaptic vesicles to release neurotransmitter (electrical to chemical)

14

Neurotransmitter crosses synapse and binds with receptor

15

Neurotransmitter is terminated by reuptake, diffusion, or degradation.