Within the peripheral nervous system, the myelin sheath is formed by
A. Schwann cells.
B. astrocytes.
C. oligodendrocytes.
D. microglial cells.
Answer: A
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Which is the correct order of the tissue layers in large blood vessels, from superficial (outermost) to deep (innermost)?
A. Tunica externa, tunica interna, tunica media B. Tunica media, tunica externa, tunica interna C. Tunica interna, tunica media, tunica externa D. Tunica externa, tunica media, tunica interna
Cell bodies of sensory neurons are located in ________
A) the thalamus B) sympathetic ganglia C) the dorsal root ganglia of the spinal cord D) the ventral root ganglia of the spinal cord
How many different amino acids compose all human polypeptides (proteins)?
A. 10 B. 15 C. 20 D. 25
Which part of the urinary system is not completely retroperitoneal?
a)kidneys b)ureters c)bladder d)nephrons