_________ opposes the effects of insulin
a. aldosterone
b. glucagon
c. epinephrine
d. Both a and b
e. Both b and c
E
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Select the structure that promotes cell adhesion
a. calmodulin. b. collagen. c. elastin. d. CAMs e. TSH.
The thymus:
(a) is the source of lymphocytes before birth and enables lymphocytes to develop into T cells (b) produces new cells and destroys the old (haematopiesis) (c) is a blood reservoir (d) defends by initiating macrophages to remove microorganisms in blood and phagocytose them
Which generalization concerning movement by skeletal muscles is not true?
A) Muscles produce movement by pulling on bones. B) The bones serve as levers. C) During contraction the two articulating bones move equally. D) The movements produced may be of graded intensity.
Cytotoxic T-lymphocytes that have killed a foreign cell may transform into
A. helper T-lymphocytes. B. memory B-lymphocytes. C. plasma cells. D. natural killer cells. E. None of the choices is correct.