A&P CNS

Multiple Choice: Circle the best answer.

The term central nervous system refers to the:

• A)  autonomic and peripheral nervous systems
• B) brain, spinal cord, and cranial nerves
• C) brain and spinal cord
• D) brain and cranial nerves

Which of these neuroglia cells forms the myelin Shealth in the central nervous system: 

• A) Astrocytes
• B) Oligodendrocytes
• C) Schwann cells
• D) ependymal cells

The Schwann cells forms a myelin sheath around the:

• A) Dendrites
• B) cell body
• C) nucleus
• D) axon

The neuron processes that normally receive incoming stimuli are called

• A) axons
• B) dendrites
• C) neurolemmas 
• D) Schwann cells

Collections of nerve cell bodies inside the CNS are called:

• A) ganglia
• B) tracts
• C) Nerves
• D) Nuclei

White matter refer to myelinated fibers in the:

• A) CNS
• B) PNS
• C) ANS
• D) SNS

Impulse conduction is fastest in neurons that are: 

• A) myelinated
• B)  unmyelinated
• C) sensory
• D) Motor

During the resting state, a neuron is: 

• A) polarized with sodium ions outside of the cell and potassium ions inside the cell
• B) propagating the action potential
• C) depolarizing and generating an action potential
• D) restoring the ionic conditions utilizing the sodium-potassium pump

Immediately after an action potential is propagated, which one of the following ions rapidly diffuses out of the cell into the tissue fluid:

• A) sodium
• B) chloride
• C) Calcium
• D) Potassium

An action potential is caused by an influx of these ions into the cell: 

• A) potassium
• B) sodium
• C) calcium
• D) magnesium