Calcium homeostasis involves
a. immediate adjustments required to maintain a constant free Ca2+ concentration on a minute-to-minute basis
b. slowly responding adjustments required to maintain a constant total amount of Ca2+ in the body
c. actions of parathyroid hormone
d. both a and c
e. both b and c
D
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In the tubular segments permeable to H2O, solute reabsorption is always accompanied by comparable H2O reabsorption
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