Neuroscience Quiz

What is synaptic transmission?

• The process of conduction within a neuron

• The communication between neurons

• The release of neurotransmitters into the synaptic cleft

• The depolarization of the presynaptic neuron

What happens when the presynaptic neuron is depolarized?

• The neuron stops functioning

• Neurotransmitters are released into the synaptic cleft

• The neuron becomes hyperpolarized

• The neuron undergoes apoptosis

What is the role of the sodium-potassium pump (Na+/K+ pump) in maintaining the resting potential of a neuron?

• It allows K+ to leak out of the neuron.

• It maintains the electrochemical gradient.

• It causes depolarization of the neuron.

• It opens voltage-gated Na+ channels.

What happens when the voltage-gated Na+ channels open in response to a stimulus?

• K+ enters the neuron.

• The membrane potential becomes negative.

• Na+ enters the neuron by diffusion.

• The neuron repolarizes.

What is the threshold potential in the context of action potential?

• The membrane potential at which K+ channels open.

• The membrane potential at which Na+ channels close.

• The membrane potential at which all voltage-gated Na+ channels open.

• The membrane potential at which the neuron is at rest.

What is the membrane potential during the resting potential phase?

• +30 mV

• 0 mV

• -55 mV

• -70 mV

What occurs during the repolarization phase of an action potential?

• Na+ channels open.

• K+ channels open.

• The membrane potential becomes more positive.

• The sodium-potassium pump is inactive.

What is the process called when the membrane potential is restored after depolarization?

• Hyperpolarization

• Depolarization

• Repolarization

• Resting potential

Which ion diffuses out of the neuron during repolarization?

• Na+

• Cl-

• Ca2+

• K+

What is the role of the Na+/K+ pump in the neuron?

• To depolarize the membrane

• To repolarize the membrane

• To reset the distribution of Na+ and K+ ions

• To open voltage-gated channels