Quiz on Nerve Impulse Physiology

What initiates the generation of a nerve impulse?

• A sudden increase in temperature

• A change in membrane potential

• A decrease in neurotransmitter levels

• An increase in blood pressure

Which phase of the action potential is characterized by the rapid influx of sodium ions?

• Resting phase

• Depolarization phase

• Repolarization phase

• Hyperpolarization phase

What triggers the release of neurotransmitters into the synaptic cleft?

• The arrival of an action potential at the axon terminal

• The synthesis of new neurotransmitters

• The breakdown of neurotransmitters

• The reuptake of neurotransmitters

During which phase of the action potential do potassium ions exit the neuron?

• Depolarization phase

• Repolarization phase

• Resting phase

• Hyperpolarization phase

What is the role of calcium ions in neurotransmitter release?

• They inhibit neurotransmitter synthesis

• They trigger the fusion of synaptic vesicles with the presynaptic membrane

• They block ion channels

• They degrade neurotransmitters

Which of the following best describes synaptic transmission?

• The direct flow of ions between neurons

• The chemical communication between neurons via neurotransmitters

• The electrical coupling of neurons

• The physical connection between neurons

What happens during the hyperpolarization phase of an action potential?

• The membrane potential becomes more positive than the resting potential

• The membrane potential becomes more negative than the resting potential

• The membrane potential returns to the resting potential

• The membrane potential remains unchanged

What is the primary function of the postsynaptic membrane in a chemical synapse?

• To release neurotransmitters

• To receive and respond to neurotransmitters

• To generate action potentials

• To store ions

What is the effect of an inhibitory neurotransmitter on the postsynaptic neuron?

• It depolarizes the postsynaptic membrane

• It hyperpolarizes the postsynaptic membrane

• It has no effect on the postsynaptic membrane

• It causes the postsynaptic neuron to release neurotransmitters

What is the primary function of neurotransmitters in the nervous system?

• To generate electrical impulses

• To transmit signals across synapses

• To store energy

• To protect neurons