Nervous physiology and cranial nerve quiz

What happens when a presynaptic neuron releases a neurotransmitter into the synaptic cleft?

• The neurotransmitter is destroyed immediately.

• The neurotransmitter binds to a receptor on the chemically gated cation channel.

• The neurotransmitter causes the cell to become more negative.

• The neurotransmitter exits the cell.

What is the result of the voltage-gated sodium channel opening in a neuron?

• Potassium exits the cell, making it more negative.

• Sodium enters the cell, making the inside more positive.

• Calcium enters the cell, making it more negative.

• Chloride exits the cell, making it more positive.

What are the two types of summation that allow EPSP to move from RMP of -70mV toward -55mV?

• Chemical and electrical

• Spatial and temporal

• Mechanical and thermal

• Linear and exponential

At what membrane potential do voltage-gated potassium channels open?

• -70mV

• 0mV

• +30mV

• -90mV

What is the process called when the inside of the cell becomes more negative due to potassium moving out?

• Depolarization

• Hyperpolarization

• Repolarization

• Neutralization

What happens when the cell membrane potential is lower than the resting membrane potential (RMP)?

• Depolarization

• Hyperpolarization

• Repolarization

• Stabilization

What happens to the action potential (AP) when it travels along an unmyelinated axon?

• It undergoes saltatory conduction.

• It travels continuously.

• It stops at the synaptic knob.

• It opens VG Calcium channels.

What is the role of voltage-gated calcium channels in synaptic transmission?

• They restore the resting membrane potential.

• They cause the release of neurotransmitter into the synaptic cleft.

• They conduct the action potential along the axon.

• They prevent neurotransmitter release.

What is the process called when an action potential travels along a myelinated axon?

• Continuous conduction

• Saltatory conduction

• Synaptic transmission

• Neurotransmitter release

What is the effect of opening voltage-gated potassium channels on the membrane potential?

• It causes depolarization.

• It causes repolarization.

• It causes stabilization.