module 5: action potentials

Question 1

first stage of action potential

Answer 1

depolarisation- sodium in channels open so sodium diffuses ink -55mv reached

Question 2

second stage of action potential

Answer 2

sodium ion channels close at 30mv and potassium channels open to potassium diffuses out to get resting potential

Question 3

stage 3 of action potential

Answer 3

hyperpolarisation- potassium ion channels slow to close so overshoot in amount of potassium out the neurone so more negative than resting

Question 4

stage 4 of action potential

Answer 4

ion channels reset, sodium potassium pump returns membrane to resting