T cells may produce _____, which is lethal to the target cells invaded by a pathogen.
A) interleukin-2
B) perforin
C) interferon
D) interleukin-3
Ans: B) perforin
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Why does the risk of cancer increase in AIDS patients?
A) Suppressor T cell activity resets the normal immune response. B) Immune surveillance is depressed. C) Cell-mediated immunity is enhanced. D) There is an increase in the circulating antibody levels. E) The virus enters human leukocytes by receptor-mediated endocytosis.
Where in the adrenal gland is cortisol produced?
A) zona glomerulosa (of adrenal cortex) B) zona fasciculata (of adrenal cortex) C) zona reticularis (of adrenal cortex) D) adrenal medulla
Where in the male reproductive system would you expect to find the most mature spermatozoa?
A) in the seminiferous tubules B) in the head of the epididymis C) in the ductus deferens and ejaculatory duct D) in the seminal gland E) in the prostate gland
Leukemia is a cancer of
A. the blood. B. connective tissue. C. the brain. D. epithelial tissue.