STEPS IN NEURAL TRANSMISSION

ALL OR NOTHING PRINCIPLE

NEURONS ARE FIRING OR RESTING, NO IN BETWEEN

RESTING POTENTIAL

NEURON AT REST

POLARIZED

AT RESTING POTENTIAL, POSITIVE IONS OUTSIDE, NEGATIVE IONS INSIDE

NEUROTRANSMITTERS #1

RIGHT SHAPED ONES WILL LOCK INTO RECEPTIOR SITES LIKE A KEY

RECEPTOR SITES

RECEIVE NEUROTRANSMITTERS OF RIGHT SHAPE

DENDRITE

WHERE RECEPTOR SITES R LOCATED

EXCITATORY V INHIBITORY

NEUROTRANSMITTERS TELL NEURON TO FIRE (EXCITATORY), TELL NEURON NOT TO FIRE (INHIBITORY)

THRESHOLD

IF CORRECT BALANCE OF EXCITATORY V INHIBIORTY, NEURONS THRESHOLD IS MET AND NEURON FIRES

NODES OF RANVIER

WHEN THRESHOLD IS MET, HOLES OPEN IN NODES OF RANVIER WHICH ALLOWS POSITIVE IONS TO CHASE NEGATIVE IONS INSIDE

DEPOLARIZED

IONS HAVE COME TOGETHER

ACTION POTENTIAL

IONS CHASING EACHOTHER, MOVING DOWN THE AXON

TERMINAL BULBS/BUTTONS

ELECTRICAL CHARGE TRAVELS DOWN AXON TERMINALS INTO THE BULBS

SACS/VESICLES

INSIDE TERMINAL BULBS ARE SACS WHICH CONTAIN NEUROTRANSMITTERS

NEUROTRANSMITTERS #2

RELEASED INTO SYNAPSE WHEN SACS ARE HIT WITH ELECTRICAL CHARGE

SYNAPSE

NEUROTRANSMITTERS IN SYNAPSE WILL FIT INTO RECEPTOR SITES OF NEIGHBORING NEURONS, CAUSING OTHER NEUTRONS TO MEET THRESHOLD

REUPTAKE

NEURON WILL SUCK MOST NEUROTRANSMITTERS BACK UP INTO SACS SHORTLY AFTER REALEASED

REPOLARIZATION

AFTER FIRING POSITIVE AND NEGATIVE NEURONS RETURN TO POLARIZED POSITION, NEGATIVE INSIDE AND POSITIVE OUTSIDE

REFRACTORY PERIOD

PERIOD OF REUPTAKE AND REPOLARIZATION, NEURON CAN NOT FIRE AGAIN DURING THIS TIME