A neuron has received a signal, causing ion channels to open in the cell membrane, letting positively charged ions flow in. This has caused the membrane potential to change suddenly from –70 to +50 millivolts. This will cause a (an) _____ to occur.
a) resting state
b) action potential
c) negative charge
d) positive charge
Answer: b The sudden reversal of the resting potential of –70 millivolts to a positive value of +50millivolts that occurs when ion channels open—allowing positively charged ions to flow in through the cell membrane—creates an action potential.
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