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