Understanding Action Potentials

What is the resting membrane potential of a neuron?

• Positive 30 millivolts

• Zero millivolts

• Negative 70 millivolts

• Positive 70 millivolts

Which neurotransmitter is mentioned as excitatory in the video?

• Dopamine

• Serotonin

• Glutamate

• GABA

What is the threshold potential that triggers the opening of voltage-gated sodium channels?

• Negative 70 millivolts

• Positive 30 millivolts

• Negative 55 millivolts

• Zero millivolts

What happens when the membrane potential reaches positive 30 millivolts?

• The resting potential is restored

• Sodium channels close and potassium channels open

• The neuron stops sending signals

• The neuron becomes hyperpolarized

What is the term for when the membrane potential goes below negative 70 millivolts?

• Resting potential

• Depolarization

• Repolarization

• Hyperpolarization