Neurons and Nerve Impulses Quiz

What is the primary function of Schwann cells?

• To transmit nerve impulses

• To form the myelin sheath

• To generate action potentials

• To connect neighboring neurons

What happens during depolarization of a neuron?

• Potassium ions exit the neuron

• The neuron is at resting potential

• Sodium ions enter the neuron

• The membrane potential becomes more negative

What is the resting membrane potential of a neuron?

• 0mV

• -55mV

• +30mV

• -70mV

What role does the sodium-potassium pump play in neurons?

• It generates action potentials

• It connects neurons to muscles

• It maintains the resting membrane potential

• It facilitates neurotransmitter release

What is the function of the nodes of Ranvier?

• To increase the speed of impulse transmission

• To protect the axon from damage

• To connect neighboring neurons

• To store neurotransmitters

What initiates an action potential in a neuron?

• An increase in sodium permeability

• A release of neurotransmitters

• A decrease in potassium permeability

• A change in calcium levels

During repolarization, which ions move out of the neuron?

• Sodium ions

• Calcium ions

• Chloride ions

• Potassium ions

What is hyperpolarization?

• The sodium channels open

• The potassium channels close

• The neuron reaches its action potential

• The neuron becomes less negative than resting potential

What is the refractory period?

• The time when neurotransmitters are released

• The time when potassium ions are pumped in

• The time when sodium channels are open

• The time when a neuron cannot be excited again

What is the role of dendrites in a neuron?

• To carry impulses away from the cell body

• To connect neighboring neurons

• To receive impulses towards the cell body

• To form the myelin sheath