Which of the following statements about the actions of antibodies in the immune response is correct?
A. Antibodies activate helper T cells and produce killer T cells.
B. Antibodies bind to antigens and trigger responses to them.
C. Helper T cells become plasma cells that secrete antibodies.
D. Antibodies work against bacteria and viruses that reproduce inside body cells.
Answer: B
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A. a low resting heart rate. B. an intense exercise regimen. C. a history of asthma. D. a history of blood clots.
Name the first stage of urine production.
A) secretion B) micturition C) filtration D) reabsorption
The Nazis
A. treated the Jews as superior to themselves. B. refused to nominate Jews for the Berlin Olympiad. C. believed strongly in the value of sport. D. were renowned for their hospitality.
Contraction of the smooth muscles results in constriction in the walls of the blood vessels.
Answer the following statement true (T) or false (F)