CalciumReg — KinFAST

Adaptive test — questions are selected based on your ability estimate. — Tag: PTHvsCalcitonin

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A patient with hyperparathyroidism has elevated parathyroid hormone (PTH) levels and elevated blood calcium. A second patient has high calcitonin levels and lower blood calcium. Which combination of statements best contrasts PTH and calcitonin in calcium homeostasis?

PTH lowers blood calcium by stimulating osteoblast activity; calcitonin raises blood calcium by inhibiting bone resorption Both hormones raise blood calcium by stimulating osteoclast activity PTH and calcitonin are released from the same gland in response to the same stimulus PTH (from parathyroid chief cells) raises blood calcium when calcium is low: it stimulates osteoclasts, increases renal calcium reabsorption, and promotes vitamin D activation to enhance intestinal calcium absorption. Calcitonin (from thyroid parafollicular cells) lowers blood calcium when calcium is high by inhibiting osteoclasts and reducing bone resorption

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