As the physiology instructor explains to the students, the kidneys regulate calcium levels within a very tight range by the activity of the parathyroid hormone (PTH) and calcitonin. Where does the fine-tuning of the calcium level occur?
A) Bowman's capsule
B) The proximal convoluted tubule
C) The distal convoluted tubule
D) The loop of Henle
C
Feedback:
PTH acts at the distal convoluted tubule to stimulate the reabsorption of calcium to increase serum calcium levels; if it is not present, the calcium is lost. Calcium is filtered at the glomerulus and mostly reabsorbed in the proximal convoluted tubule and the ascending loop of Henle. Bowman's capsule is part of the renal corpuscle that acts as a sieve or a strainer to allow fluid to flow through, but also keeps large particles from entering.
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