Neuronal Signaling Quiz Topic 13

What does the word “pump” refer to in “Na+ -K+ pump”?

• Action potential

• Membrane potential

• Ion channels

• Neurotransmitters

How does a cell reach threshold potential?

• By hyperpolarizing the membrane

• By releasing neurotransmitters

• By opening and closing ion channels

• By depolarizing the membrane

What is the function of the myelin sheath in neurons?

• To produce neurotransmitters

• To insulate axons and increase the speed of nerve impulses

• To open and close ion channels

• To fire action potentials

Where do action potentials fire in myelinated axons?

• At the nodes of Ranvier

• At the axon terminal

• At the myelin sheath

• At the glial cells

How do neurons communicate with neighboring nerve or muscle cells?

• Through neurotransmitters

• Through action potentials

• Through myelin sheath

• Through ion channels

What triggers the release of neurotransmitters from vesicles within the axon terminal?

• Myelin sheath insulation

• Ion channel opening

• Membrane potential changes

• Arriving action potential

What is the result of excitatory stimuli on the membrane?

• Hyperpolarization

• Excitatory postsynaptic potential (EPSP)

• Inhibitory postsynaptic potential (IPSP)

• Depolarization

What is the result of inhibitory stimuli on the membrane?

• Hyperpolarization

• Action potential firing

• Excitatory postsynaptic potential (EPSP)

• Depolarization

How can EPSPs and IPSPs be summed over time and space?

• Refraction and depolarization

• Temporal summation and spatial summation

• Threshold potential and action potential

• Neurotransmitter release and ion channel opening

What is the function of neurotransmitters in the synapse?

• To open ion channels

• To bind to receptors in the presynaptic membrane

• To produce myelin sheath

• To fire action potentials