Vasomotion is associated with the presence of
a) collagen and elastic tissue in the tunica media.
b) elastic tissue in the tunica externa.
c) endothelium in the tunica interna.
d) smooth muscle in the tunica media.
e) fenestrations in the tunica externa.
Answer: d) smooth muscle in the tunica media.
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Which embryonic germ layer forms the linings of the respiratory and digestive tracts?
A) mesoderm B) ectoderm C) trophoderm D) endoderm E) epiderm
Which of the following is not true of keratin?
a. It prevents excessive fluid loss. b. It fills cells of the stratum corneum. c. It helps prevent ultraviolet rays from penetrating the interior of the body. d. All of the above are true of keratin.
Select the major waste product of nitrogen metabolism
a. plasma proteins. b. urea. c. glucose. d. PO4. e. amino acids.
Water accounts for 50% of the weight of a young adult female and 60% of a young adult male. What kind of bond is found at "B"?
A. oxygen atom B. polar covalent bond C. water molecule D. hydrogen atom E. hydrogen bond