When blood calcium levels fall, ____

a. PTH secretion increases
b. osteoblast activity increases
c. osteoclast activity decreases
d. growth hormone activity increases
e. calcitonin secretion increases


ANSWER: a

Biology & Microbiology

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All of the following types of chemical bonds are responsible for maintaining the tertiary structure of

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b. hydrogen bonds.
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d. disulfide bonds.
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