Endocrine System and Hormones · Zoology

The hormone responsible for lowering blood calcium levels is:

  1. Parathyroid hormone (PTH)
  2. Calcitonin (thyroid C-cells)
  3. Vitamin D (calcitriol)
  4. Aldosterone (mineralocorticoid)
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Correct answer: Calcitonin (thyroid C-cells)

Calcitonin reduces blood calcium by inhibiting bone resorption. It is secreted by the thyroid gland.

Difficulty: Medium Question 16 of 20

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