Summation

Question 1

What is summation

Answer 1

When the effects of neurotransmitters released from many neurones is added together, makes it more likely post synaptic membrane will be excited and generate an action potential

Question 2

What is spatial summation

Answer 2

When two or more presynaptic neurones release their neurotransmitters at the same time into the same post synaptic neurone, the small amount of NTs released from each of these neurones can be enough altogether to reach threshold and trigger an AP

Question 3

Which type of NTs trigger an action potential

Answer 3

Only excitatory

Question 4

What happens in spatial summation if some neurones release an inhibitory NT

Answer 4

Total effect of all NTs may be no action potential

Question 5

What is temporal summation

Answer 5

When two or more nerve impulses arrive in quick succession from the same presynaptic neurone, makes AP more likely because more NT released into synaptic cleft