synaptic transmission

Question 1

outline synaptic transmission

Answer 1

action potential reaches the end/ terminal button in presynaptic neuron
neurotransmitters in vesicles endure exocytosis and diffuse into synaptic cleft
neurotransmitters bind to the specific shaped receptor sites on surface of post synaptic neurone
the chemical impulse is converted into an electrical impulse to repeat cycle of electrical transmission again until reaches its own terminal buttons

Question 2

why do neurotransmitters only move in one direction across synapses

Answer 2

because they are released from presynaptic neurone and the immediately bind to SPECIFIC receptor sites preventing them from going in opposite direction

Question 3

inhibitory neurotransmitters

Answer 3

inhibitory neurotransmitters inhibit firing of neurones in neighbouring neurone. they do this by making the charge more negative so kt is less likly to fire a neurone.
EXAMPLE- seretonin is an inhibitory neurone

Question 4

excitory neurotransmitters

Answer 4

increase positive charge of neighbouring neurone making it more likely to fire
eg dopamine

Question 5

summation

Answer 5

net effect
whether a neurotransmitter fires
sums up in and ex influences
the one with the most net influence is the result in next neurone
only triggers action potential in next neurone if threshold is reached