Process If Synaptic Transmission, Inuding Neurotransmitters Excitation And Inhibitation Flashcards
Intro
What are the chemical massagers within the brain and what is their role?
-neurotransmitters
Role= transmit info from one neuron to another so that person performs an action e.g movement or emotional response.
Process of synaptic transmission
1
-Begins in pre synaptic neuron,
-electrical nerve impulses send down the axon until reach pre synaptic terminal
Process of synaptic 2
-This causes neurotransmitters
-stored in vesicles
-only located in pre-synaptic neuron
-to be released into synaptic cleft
Process of synaptic transmission 3
-neurotransmitters diffuse across synapse
-bind with specific sites that are ONLY present on the post synaptic neuron
4 process of synaptic
Once enough neurotransmitters attached to receptors on post-sn
-2 outcomes
First outcome
Next neuron ready to fire an impulse
Weather it is excitatory effect or inhibitory
Second outcome
Neurotransmitters cycled to be restored back
-reuptake
1 Drugs can be used for what?
2 And work by effecting?
1 To increase or decrease levels of neurotransmitters
2 the transmission of neurotransmitters across synapse
EXCITATORY NEUROTRANSMITTERS
E.g adrenaline
-binds to post-s receptor,
-post synaptic cell becomes positive chargerd
-more likely post-s cell fire, so an impulse is travel down its axon.
-inc brain activity in CNS
INHIBITORY NEUROTRANSMITTERS
-bind to post-s receptors
-post-s cell= negatively charged
-reduces likelihood post-s cell will fire
-decreases brain activity in CNS
SUMMATION
-excitatory and inhibitory influences added together
-overall effect is negatively charged
-reduces likelihood neuron will fire impulse down the post-s neuron
If its positively charged
-impulse will fire an impulse down the post synaptic neuron
