The effect of parathyroid hormone on blood chemistry is most directly opposed by the effect of
a. Thyroid-stimulating hormones.
b. thyroxin.
c. calcitonin.
d. melatonin.
e. cortisol.
B; Parathyroid hormone promotes removal of calcium from the bones and release to the blood. Calcitonin promotes calcium deposition in the bones from the blood. TSH promotes release of thyroxin (choices a and b), which maintains basal metabolic rate. Melatonin promotes sleep and inhibits gonadal development. Cortisol mobilizes glucose during stress.
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The ________ are drugs that deposit in developing teeth and cause a permanent brown discoloration.
A. tetracyclines B. penicillins C. streptomycins D. cephalosporins E. macrolides
A chemical substance that behaves as a natural
analgesic is a. an amphetamine. b. LSD. c. epinephrine. d. an endorphin. e. none of these.
Which muscle cells are designed for endurance?
A) hemoglobin B) slow-twitch cells C) fast-twitch cells D) myoglobin
Emil von Behring and Shibasaburo Kitasato demonstrated the body's defense mechanism against disease known as
A. Humoral immunity (antibody mediated) B. Cell-mediated immunity C. Both humoral immunity and cell-mediated immunity D. Neither humoral immunity nor cell-mediated immunity