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Praxis II Physical Education Exam Prep

Category - Praxis II PE Test Prep

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When plasma calcium concentration falls below homeostatic levels (9-10mg/dL) the brain responds by releasing parathyroid hormone, which triggers:
  1. Increased absorption by intestine
  2. Increased reabsorption via kidney
  3. Increased bone resorption
  4. All of the above
Explanation
Answer: D - When plasma calcium concentration falls below homeostatic levels (9-10mg/dL) the brain responds by releasing parathyroid hormone which triggers increased absorption and reabsoprtion of calcium by the intestine and liver respectively. Additionally bone resorption occurs, and calcium is released from the bones into the bloodstream.
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