Role of Calcitonin and Parathyroid Hormone in bone deposition and resorption

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step 1

PTH activates osteoclasts

calcitonin inhibits

osteoclast activity and bone resorption promotes bone deposition

step 3

release calcium to bone

Calcitonin is released by

thyroid glands if blood calcium levels increase

step 2

resorbs bone

Parathyroid hormone is released from

the parathyroid glands when blood calcium levels drop.


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