Nerve impulse transmission

Question 1

what is resting membrane potential?

Answer 1

A state where there is no net flow of ions across the membrane

Question 2

what does a transmission of a nerve impulse require?

Answer 2

changes in the membrane potential of the neuron’s plasma membrane

Question 3

how does neurotransmitters initiate a response?

Answer 3

by binding to their receptors at a synapse

Question 4

what does despoliation of the plasma membrane as a result of the entry of positive ions trigger?

Answer 4

opening of voltage gated sodium channels and further depolarization

Question 5

what restors the resting membrane potential?

Answer 5

inactivation of the sodium channel and the opening of potassium channels

Question 6

what does depolirsation of a patch of membrane cause?

Answer 6

neighbouring regions of membrane to depolarise and go through thre same cycle

Question 7

what happens when the action potential reaches the end of the neuron?

Answer 7

causes vesicles containing neurotransmitters to fuse with the membrane
releases neurotransmitters which stimulates a response ina connecting cell

Question 8

What does restoritaion of the resting membrane potential allow?

Answer 8

the inactive voltage gated sodium channels to return to a conformation
They can open again in response to depolarization of the membrane

Question 9

How are ion concentration gradients re-established?

Answer 9

by the sodium- potassium pump which actively transports excess ions in and out of cells