signaling in the NS pt 2

Question 1

Changes in permeability evoke a _____ response or _____ potential

Answer 1

graded

Question 2

IPSP - inhibitory post synaptic potential

Answer 2

Vm hyperpolarizes or stabilizes; decrease the probability of firing an action potential

Question 3

EPSP - excitatory post synaptic potential

Answer 3

Excitatory = Vm depolarizes; the probability of firing an action potential

Question 4

do action potentials vary in amplitude?

Answer 4

no

Question 5

do graded potentials vary in amplitude

Answer 5

yes

Question 6

why do action potentials not summate?

Answer 6

the refractory period makes it all or nothing

Question 7

Whether the post synaptic response is an IPSP or EPSP is determined by

Answer 7

Neurotransmitter released
Receptor at the post-synaptic cell
Whether ion channels open or close

Question 8

A typically neuron receives_____ of synapses!

Answer 8

thousands

Question 9

Postsynaptic Inhibition

Answer 9

Acts by increasing permeability of postsynaptic K+ or Cl- channels, decrease probability of postsynaptic neuron firing an action potential