Quiz on Nerve Cells and Impulses

Which part of the neuron receives input from other neurons?

• Axon terminal

• Soma

• Dendrite

• Synapse

The myelin sheath is formed by:

• Astrocytes and microglia

• Schwann cells and oligodendrocytes

• Ependymal cells and astrocytes

• Dendrites and axons

Which of the following is NOT a function of glial cells?

• Providing nutrients

• Removing waste

• Conducting action potentials

• Forming myelin

The resting potential of a neuron is typically:

• +70 mV

• -70 mV

• 0 mV

• -120 mV

The 'all-or-none' law of action potentials means:

• Larger stimuli produce larger action potentials

• Once threshold is reached, an action potential always occurs

• Neurons can fire at varying strengths

• Action potentials can travel in both directions

The Na+/K+ pump moves:

• 3 sodium ions out, 2 potassium ions in

• 2 sodium ions in, 3 potassium ions out

• Sodium and potassium equally in both directions

• Calcium and chloride across the membrane

Demyelination in multiple sclerosis primarily slows down:

• Neurotransmitter release

• Saltatory conduction

• Action potential threshold

• Receptor binding

Which glial cell is responsible for immune defense in the CNS?

• Astrocyte

• Oligodendrocyte

• Schwann cell

• Microglia

Which ion is primarily responsible for the depolarization phase of an action potential?

• Calcium

• Sodium

• Potassium

• Chloride

What is the main function of astrocytes in the nervous system?

• Insulate axons

• Provide structural support

• All of the above

• Facilitate neurotransmitter recycling