Question

Select all of the following that are true about a neuron’s function.

An action potential occurs if the membrane potential exceeds the threshold potential.

A neuron expends no energy while it maintains a resting potential. When the neuron receives a stimulus, sodium ions begin to rush out of the axon.

When threshold potential is reached, sodium channels all along the axon open up at once.

An axon maintains a positive charge during rest. During the peak of an action potential, more sodium ions are found inside the axon than when it is at resting potential.

During an action potential in one section of an axon, sodium channels first open, then delayed potassium channels open and sodium channels close.

Answer 1

Answer: Choices 1, 3, 5

Explanation: The transmission of nerve impulse across a neuron is a systematic event in which the resting membrane potential is kept at negative value of nearly -70 mV. As the action potential is applied, it crosses the threshold value and increases towards positive side due to opening of sodium channesl. Further, if the sodium channels delay in openeing, late-type potassium channels open up to maintain the action potential and nerve impulse excitation.