Action Potential Physiology (Part 1)

The video tutorial explains the concept of action potential in neurons, focusing on the role of the axon and the importance of membrane potential as voltage. It details the function of the sodium-potassium pump in maintaining ion concentration gradients and describes the propagation of action potential along the axon. The tutorial also covers the role of voltage-gated sodium and potassium channels in facilitating ion movement and charge distribution, emphasizing the unidirectional flow of action potential and the restoration of resting potential.

What is the resting membrane potential of a neuron?

• 0 millivolts

• -30 millivolts

• -70 millivolts

• 70 millivolts

Which part of the neuron does the action potential occur in?

• Dendrites

• Axon

• Nucleus

• Soma

What is the primary function of the sodium-potassium pump?

• To generate action potentials

• To maintain ion concentration gradients

• To produce ATP

• To transport glucose

Where is the concentration of sodium ions highest at rest?

• In the nucleus

• In the mitochondria

• Inside the cell

• Outside the cell

What triggers the opening of voltage-gated sodium channels?

• Presence of calcium ions

• Change in voltage

• Increase in light

• Decrease in temperature

What is the main role of voltage-gated potassium channels during an action potential?

• To transport calcium ions

• To generate ATP

• To repolarize the cell

• To depolarize the cell

What happens to potassium ions when voltage-gated potassium channels open?

• They move into the cell

• They move out of the cell

• They remain stationary

• They convert to sodium ions

What is the role of the sodium-potassium pump after an action potential?

• To depolarize the cell

• To generate action potentials

• To transport glucose

• To restore ion concentrations

What is the net charge inside the cell at rest?

• Variable

• Neutral

• Negative

• Positive

What is the action potential primarily caused by?

• Influx of sodium ions

• Efflux of calcium ions

• Efflux of sodium ions

• Influx of potassium ions