Nervous System

These type of neurons have their axons and dendrites fused with the soma to the side:

• Bipolar

• Unipolar

• Multipolar

Which of these cells help with immune defense in the CNS?

• Microglia

• Ependymal cells

• Satellite Cells

• Oligodendrocytes

Which of these cells are found in the PNS only?

• Astrocytes and ependymal cells

• Schwann cells and oligodendrocytes

• Schwann cells and satellite cells

• Satellite cells and astrocytes

Ligand-gated channels open and close in response to a mechanical vibration or pressure

• True

• False

Which of these form the myelin sheath in the CNS

• Schwann cells

• Astrocytes

• Oligodendrocytes

• Satellite cells

During depolarization in an action potential, the stimulus triggers what to happen?

• the sodium channels open and sodium ions spill out

• the sodium channels open and sodium ions come in

• the potassium channels open and potassium ions spill out

This stage of an action potential is when the potassium channels open and potassium ions flow out of the cell:

• Repolarization

• Hyperpolarization

• Depolarization

• Resting potential

The refractory period is the period of time during which a neuron can't generate another action potential

• True

• False

What does the brain stem consist of?

• cerebellum, pons, midbrain

• cerebrum and pons

• medulla oblongata, pons, cerebellum

• medulla oblongata, pons, midbrain

What percentage of the total blood supply does the brain receive? A. 25% B. 10% C. 20% (correct) D. 15%

• A. 25%

• B. 10%

• C. 20%

• D. 15%