12.3 Electrical Signals in Neurons (16min)

What is the primary role of the sodium-potassium pump in a neuron?

• To produce ATP for the neuron

• To maintain the resting membrane potential

• To transport nutrients into the neuron

• To generate electrical signals

What happens to the interior of a neuron during depolarization?

• It becomes more negatively charged

• It becomes more positively charged

• It remains unchanged

• It loses all electrical charge

What determines the strength of a graded potential in a neuron?

• The size of the neuron

• The strength of the stimulus

• The number of sodium-potassium pumps

• The length of the axon

What is the threshold voltage required to trigger an action potential?

• Negative 70 millivolts

• Positive 30 millivolts

• Negative 55 millivolts

• Zero millivolts

What is the purpose of the refractory period in a neuron?

• To prevent overlapping action potentials

• To stop the neuron from firing again

• To increase the speed of electrical signals

• To allow the neuron to rest permanently