Which of the following are true of macrophages?
A. They trap and digest cellular debris.
B. They are responsible for cellular immunity.
C. They produce antigens.
D. They remove old blood cells.
Answer: A
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Side effects of excessive doses of this vitamin cause prolonged bleeding time.
a. A b. E c. C d. K
The care of the elderly is managed by a physician specialist known as a(n):
A. general practitioner B. gerontologist C. obstetrician D. pediatrician
Which of the following is true of the 1960 Rome Olympiad?
A. Abebe Bikila, a marathoner from Ethiopia, won the gold medal and ran the marathon through the streets of Rome barefoot. B. The Italian organizing committee did a splendid job. C. There were numerous disputes that arose as a result of "questionable" officiating. D. The Olympic Games were a major source of propaganda for both the United States and the Soviet Union. E. All of the answers are correct.
A blood enzyme which causes clotting by forming fibrin is:
A) thromboplastin. B) globulin. C) heparin. D) thrombin.