Macrophages that migrate to the epidermis to guard against pathogens are known as __________ cells.
Fill in the blank(s) with the appropriate word(s).
dendritic or Langerhans
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Which of the following is true of adulthood?
a. growth hormone exerts no effects on body tissues. b. The secretion of growth hormone ceases altogether. c. Growth hormone cannot stimulate increases in the length of long bones. d. The structure of bone becomes permanently fixed. e. none of the above.
All of the following are derived from epithelial columns except
A) hair roots. B) hair follicles. C) nails. D) sebaceous glands. E) sweat glands.
Which of the following is not a chemical class of neurotransmitters?
A) biogenic amine B) nucleic acid C) amino acid D) ATP and other purines
When necessary, blood bypasses a capillary bed through
A) an arterial anastomosis. B) venous valves. C) arteriovenous anastomoses. D) precapillary sphincters. E) venules.