Complete each sentence describing the role of calcitonin in controlling blood calcium levels. Labels can be used more than once. When levels of blood calcium (Click to select) , calcitonin is released from the C cells of the thyroid gland. The circulating calcitonin (Click to select) osteoclasts and (Click to select) osteoblasts within minutes. The effects on osteoclasts cause a decrease in bone resorption. Also, a(n) (Click to select) in bone deposition occurs due to increased activity of osteoblasts. The decline in bone breakdown and increased mineralization causes blood calcium to (Click to select) back to normal levels. Enter the steps involved in the hormonal regulation of bone calcium deposition and resorption.
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Step 1: When levels of blood calcium decrease, calcitonin is released from the C cells of the thyroid gland. Show more…
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Complete each sentence by dragging the proper word or phrase into the appropriate position. Then place each sentence in the order of the mechanisms following the secretion of calcitonin. When levels of blood calcium increase in children, calcitonin is released from the follicle cells of the thyroid gland. The effects on osteoclasts cause a decrease in bone resorption and a concurrent increase in bone deposition due to the activity of osteoblasts. This circulating calcitonin inhibits C cells within minutes and stimulates osteocytes. The decline in bone breakdown and increased mineralization causes blood calcium to decrease back to normal levels.
Sri K.
Bone is a dynamic tissue constantly undergoing change. As shown in the diagram below, two sets of bone cells work in opposition to one another to maintain bone homeostasis. Osteoblasts build bone, while osteoclasts break down bone. Blood calcium levels change in response to these cell activities. Osteoblasts Osteoclasts Bone building Bone breakdown Calcium in blood Calcium in blood Calcitonin is a hormone produced by the thyroid gland. Calcitonin is released whenever blood calcium levels go up. Calcitonin travels through the blood to bone, where it activates one of the two types of bone cells and inhibits the other type. Predict the type of cells that will be activated by calcitonin. Predict the type of cells that will be inhibited by calcitonin. Justify your responses.
Sydney R.
How does calcitonin affect calcium levels in the body? It inhibits osteoclasts and reduces bone resorption, stimulates osteoblasts to deposit calcium into bone, increases calcium absorption by the small intestine, reduces osteoblast activity, promotes osteoclasts and bone resorption, promotes calcium reabsorption by the kidneys, and lowers blood phosphate levels by promoting urinary excretion.
Adi S.
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