The lumen of every blood vessel is lined by a monolayer of what cell type?
A) endothelial cells
B) smooth muscle cells
C) erythrocytes
D) fibroblasts
E) platelets
Ans: A) endothelial cells
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Erectile dysfunction
a. Affects about 30 million men in the U.S. b. can be a complication of smoking. c. can be a complication of circulatory problems. d. usually affects men as they age. e. includes all of these.
A 45-year-old man has pus-filled vesicles distributed over his back in the upper right quadrant, over his right shoulder, and upper right quadrant of his chest. His symptoms are most likely due to
A) Candida albicans. B) herpes simplex virus. C) Staphylococcus aureus. D) Streptococcus pyogenes. E) varicella-zoster virus.
In humoral immunity, cells that are produced by activated B cells and function by secreting antibodies are called
A. cytotoxic T cells. B. helper T cells. C. plasma cells. D. macrophages. E. memory cells.
The physical place where members of a population typically live is termed a
A. symbiont. B. niche. C. habitat. D. community. E. competitive zone.