Which cells fight infection by producing antibodies?
A. T cells
B. Natural killer cells
C. B cells
D. Eosinophils
E. Macrophages
C. B cells
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Aging of the brain begins
A. before birth. B. at birth. C. after age 50. D. at age 30.
Increasing levels of cortisol inhibit the release of corticotropin-releasing hormone (CRH)
Indicate whether this statement is true or false.
Which of the following red blood cell disorders may provide a better chance of surviving where malaria is present?
A) aplastic anemia B) sickle cell anemia (SCA) C) pernicious anemia D) polycythemia E) hemolytic anemia
Platelets ______, because of their being exposed to ______.
A) Stick to the damaged area of a blood vessel and help seal the break, plasma B) Stick to the damaged area of a blood vessel and help seal the break, smooth muscle C) Stick to the damaged area of a blood vessel and help seal the break, collagen in the basement membrane D) None of the above