Which type of neuroglia forms the myelin sheath around some axons of the PNS (peripheral nervous system)?
A. Schwann cells
B. Astrocytes
C. Ependymal cells
D. Oligodendrocytes
E. Satellite cells
Answer: A
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List and describe three pressures operating at the filtration membrane, and explain how each influences net filtration pressure.
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The ________ help to prevent prolapse of the atrioventricular valves during ventricular systole.
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Chemical barriers composed of phospholipid bilayers form within biological systems because
A. the inability of the polar heads to dissolve in water causes the heads to adhere to one another. B. hydrophobic exclusion results in the close positioning of the nonpolar tails. C. van der Waals forces attract the polar heads to the water inside the cell. D. cells expend ATP to position the phospholipid tails close together.
Foramina in the skull serve as passageways for blood vessels, nerves, and other structures. Which of these foramina is covered by connective tissue in adults, and therefore does not serve as a passageway?
A. Foramen ovale B. Foramen lacerum C. Foramen spinosum D. Foramen magnum E. Foramen rotundum