Hormone
Hormone
Hormone
Calcitonin
(minimal role)
(minimal role)
- Peptide hormone produced by parafollicular cells of the thyroid gland
- Secretion stimulated by an increase in serum calcium levels
- Acts to decrease serum calcium levels when elevated (physiological antagonist to PTH)
- Bone: Prevents resorption by inhibiting osteoclast activity and stimulating osteoblast activity
- Kidneys: Weak action to decrease calcium reabsorption