Question

Choose "all that are true regarding the resting membrane potential" a. It has a negative value. b. It is measured in millivolts. c. It is measured in millivolts. d. It can range from −40 to −90 millivolts. e. It can range from −40 to −90 millivolts. f. It reflects a more negative voltage in the interstitial fluid compared to the cytosol.

Answer 1

Answer:

a. It has a negative value.

b. It is measured in millivolts.

c. It is measured in millivolts.

Explanation:

Resting membrane potential is typically ~ -70 millivolts so options a, b and c are correct, rest are false statements.

The resting membrane potential is -70 millivolts because more K+ is inside the neuron while more Na+ is outside the neuron and it reflects more negative voltage in the cytosol as compared to the interstitial fluid.

As soon as stimulus arrives, it causes more Na+ to move inside the neuron making the membrane potential as +20 millivolts and the neuron is said to be in 'depolarized state'. Soon after that K+ starts to move outside of the neuron and since K+ has positive charge and it is moving out of the cell so the membrane becomes more and more negative inside and at this time neuron is said to be in 'hyperpolarised state'.