action potential

What is the typical duration of an action potential in a neuron?

• 1 to 2 milliseconds
• 5 to 6 milliseconds
• 10 to 15 milliseconds
• 20 to 25 milliseconds

Which ion channel state is characterized by being closed and incapable of opening?

• Resting state

• Activated state

• Inactivated state

• Open state

At the peak of the action potential, the membrane potential approaches:

• -90 mV

• 0 mV

• +30 mV

• +60 mV

What triggers the opening of voltage-gated sodium channels during an action potential?

• Hyperpolarization

• Depolarization

• Repolarization

• Resting potential

During the relative refractory period, a neuron can only be activated by:

• A normal stimulus

• A stronger-than-normal stimulus

• No stimulus

• Any stimulus

Which ion is primarily responsible for the depolarization phase of an action potential?

• Potassium (K+)

• Sodium (Na+)

• Calcium (Ca2+)

• Chloride (Cl-)

Nodes of Ranvier are:

• Sites of continuous conduction

• Sites of saltatory conduction

• Gaps between neurons

• Sites of neurotransmitter release

What is the effect of myelination on the speed of action potential conduction?

• It decreases the speed

• It has no effect on the speed

• It increases the speed

• It stops conduction

What is the main function of the sodium-potassium pump in maintaining the resting membrane potential?

• Pumping sodium out and potassium in

• Pumping potassium out and sodium in

• Pumping calcium out and sodium in

• Pumping chloride in and sodium out

The absolute refractory period is primarily due to the:

• Inactivation of sodium channels

• Activation of potassium channels

• Inactivation of potassium channels

• Activation of calcium channels