Calcitonin and Parathyroid Hormone
target of calcitonin
bone tissue
target of parathyroid hormone
bone tissue and kidney
what happens if parathyroid hormone levels are too high?
bones will get thin and weaken and could cause osteoporosis
secreted by parafollicular cells that surround the thyroid follicles by TH
calcitonin
effects of calcitonin
inhibits osteoclasts and activates uptake of calcium into bone by osteoblasts lowering blood Ca level
effects of parathyroid hormone
overall elevates blood calcium levels by activating osteoclasts in bone to degrade the bone matrix and liberate calcium
gland adjacent to the thyroid gland
parathyroid gland
what does the parathyroid gland secrete?
parathyroid hormone
regulation of secretion of calcitonin
released when blood levels of calcium are high, decreased when blood levels of calcium are low
regulation of secretion of parathyroid hormone
released when blood levels of calcium are low; decreased when blood levels of calcium are high