Nervous System Impulse Potential

What is the name of the electrical impulse that neurons send responsible for every action, thought, and emotion?

• Resistance

• Action potential

• Current

• Voltage

What is the measure of potential energy generated by separated charges?

• Watts

• Ohms

• Volts

• Amps

What is the resting membrane potential of a neuron?

• -100 mV

• -70 mV

• -40 mV

• -20 mV

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

• To maintain the resting membrane potential

• To generate action potential

• To release neurotransmitters

• To regulate hormone levels

What type of channels open at certain membrane potentials and close at others?

• Potassium channels

• Voltage-gated channels

• Ligand-gated channels

• Mechanically gated channels

What is the threshold membrane potential required for an action potential to kick in?

• -20 mV

• -55 mV

• -70 mV

• -40 mV

What happens when the voltage-gated sodium channels open during an action potential?

• Sodium ions rush out, making the cell repolarized

• Potassium ions rush out, making the cell repolarized

• Sodium ions rush in, making the cell depolarized

• Potassium ions rush in, making the cell depolarized

What is the brief depolarization caused by changes in currents during an action potential called?

• Action potential

• Repolarization

• Hyperpolarization

• Graded potential

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

• To prevent signals from traveling in both directions down the axon at once

• To increase the speed of action potential transmission

• To regulate the release of neurotransmitters

• To maintain the resting membrane potential

What is the name of the process where a current can effectively leap from one gap in the myelin to the next?

• Repolarization

• Saltatory conduction

• Graded potential

• Hyperpolarization