A young woman has noticed that her thyroid appears enlarged. One of the diagnostic procedures used to produce an image of her thyroid requires this type of substance that emits high-energy radiation.
a. ions
b. radioisotopes
c. radio-isomers
d. isomers
b. radioisotopes
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Which cell type stands guard to alert the body of pathogens entering through the skin?
A. Dendritic cells B. B Plasma cells C. T Helper cells D. Natural killer cells
Phosphodiesterase functions
A. activates cGMP. B. to attach phosphate groups to enzymes. C. as a membrane-bound receptor molecule. D. to inactivate cyclic AMP. E. to combine GTP with cyclic AMP.
Tetany resulting from uncontrolled muscle spasms may indicate a malfunction of the ________
A) pineal gland B) thymus C) parathyroid glands D) adrenal cortex E) posterior pituitary
When forming a bond, an atom that has 3 electrons in its second shell and a filled first shell will
A. lose all of the electrons from both its first and second shells. B. lose 3 electrons from its second shell. C. lose all of the electrons from its first shell. D. gain 5 electrons in its second shell.