Which trait is unique to arteries?
A) They have three tunics.
B) They contain valves to prevent backflow.
C) They transport blood away from the heart.
D) They have a thinner tunica media.
Answer: C
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Which of the following indicates that the immune system has achieved versatility?
A) Millions of NK cells are produced to ensure efficient immune surveillance. B) Lymphocytes, which are sensitive to an antigen, undergo repeated cell divisions. C) Production of many normal B cells and T cells, which will attack "self" antigens, occurs. D) Lymphocyte cell divisions produce two cell types: one group, which will attack specific antigens, and another group, which will remain inactive until exposed to the same antigen later. E) Millions of different lymphocyte populations are produced, each with different antigen receptors.
Which veins drain blood from the diaphragm?
A) phrenic veins B) hepatic veins C) adrenal veins D) renal veins
Ganglionic neurons innervate as all of the following except
A) smooth muscle. B) cardiac muscle. C) adipose tissue. D) glands. E) skeletal muscle.
Which function of proteins is NOT correctly matched with the example?
A. structure – collagen and keratin B. regulation – enzymes and hormones C. transport – hemoglobin D. contraction – actin and myosin in muscles E. protection – packing around organs and glands