Homeostasis and feedback · Physiology

Which feedback mechanism is most important for maintaining plasma calcium levels?

  1. Positive feedback driven mainly by calcitonin secretion
  2. Negative feedback via parathyroid hormone
  3. Neural reflex arcs acting on their own
  4. Renal autoregulation of blood flow alone
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Correct answer: Negative feedback via parathyroid hormone

Parathyroid hormone is regulated by negative feedback from plasma calcium levels. This maintains calcium homeostasis.

Difficulty: Medium Question 14 of 20

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