Action Potential Physiology (Part 2)

The video tutorial explains the process of action potential in neurons, focusing on the movement of sodium and potassium ions across the cell membrane. It covers depolarization, repolarization, and hyperpolarization phases, highlighting the role of voltage-gated channels. The tutorial also discusses the propagation of action potential along the axon to the axon terminal, where neurotransmitters are released into the synapse. A graph illustrating voltage changes during these phases is also explained.

What is the term used to describe the buildup of positive charge inside a cell when sodium ions rush in?

• Repolarization

• Hyperpolarization

• Depolarization

• Resting potential

What causes the potassium channels to open during an action potential?

• Calcium influx

• Negative charge buildup

• Decrease in sodium ions

• Positive charge buildup

What is the role of the axon terminal in neuron communication?

• It generates action potentials

• It stores neurotransmitters

• It repolarizes the neuron

• It forms a connection with another cell

What is the space between the axon terminal and another cell called?

• Dendrite

• Synapse

• Axon hillock

• Node of Ranvier

What is the typical resting membrane potential of a neuron?

• Positive 30 millivolts

• Negative 70 millivolts

• Zero millivolts

• Negative 90 millivolts

What happens during the repolarization phase of an action potential?

• Calcium ions enter the cell

• Chloride ions leave the cell

• Potassium ions leave the cell

• Sodium ions enter the cell

What is the function of the sodium-potassium pump in neurons?

• To maintain the resting membrane potential

• To depolarize the cell

• To open voltage-gated channels

• To release neurotransmitters