Neuron Transmission Quiz

What is the resting potential of a neuron?

• +30 mV

• -55 mV

• -70 mV

• 0 mV

Which ions are actively pumped by the sodium-potassium pump during the resting state?

• 3 Na+ in, 2 K+ out

• 2 Na+ in, 3 K+ out

• 3 Na+ out, 2 K+ in

• 3 K+ out, 2 Na+ in

What triggers the opening of voltage-gated sodium channels?

• Hyperpolarization

• Reaching the threshold potential

• Repolarization

• Presence of neurotransmitters

How does the myelin sheath speed up nerve impulse transmission?

• By increasing the size of the axon

• By cooling the axon

• Through saltatory conduction between nodes of Ranvier

• By storing neurotransmitters

What is the role of calcium ions at the synapse?

• They repolarize the membrane

• They increase resting potential

• They trigger neurotransmitter release

• They close sodium channels

Which phase of the action potential involves sodium ions rushing into the neuron?

• Resting potential

• Depolarization

• Repolarization

• Hyperpolarization

What happens when the neuron reaches threshold potential?

• The neuron returns to resting state

• Potassium channels open first

• An action potential is triggered

• Neurotransmitters are released

What is the function of the myelin sheath?

• Produces neurotransmitters

• Prevents signal transmission

• Increases the speed of signal conduction

• Slows down the action potential

What would happen if the myelin sheath is damaged?

• Increased resting potential

• Faster nerve impulse transmission

• Slower or disrupted signal conduction

• Constant action potentials

What enables communication across the synapse between two neurons?

• Potassium ions

• Sodium ions

• Neurotransmitters

• Myelin