Summations Flashcards
1
Q
what is summation?
A
the effects of neurotransmitters released from many neurones, or one neurone that stimulated a lot in a short period of time is added together
2
Q
what are the two types of summation?
A
- temporal summation
- spatial summation
3
Q
what is spatial summation?
A
- where two or more presynaptic neurones release their neurotransmitters at the same time onto the same postsynaptic neurone
- the small amount of neurotransmitter released from each of theses neurones can be enough altogether to reach threshold in postsynaptic neurone and trigger an action potential
4
Q
what happens in spatial summation if some neurones release inhibitory neurotransmitters?
A
total effect of all neurotransmitters would be no action potential
5
Q
what is temporal summation?
A
when two or more nerve impulses arrive in quick succession from the same presynaptic neurone
- action potential is more likely as the neurotransmitters are released into the synaptic cleft
