ENDOCRINE ORGANS AND RESPIRATORY SYSTEM
PARATHYROID
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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To increase the amount of calcium in the blood so that it is available for the bones
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To decrease the amount of calcium in the blood so that it is available for the bones
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To break down bones to release calcium into the blood
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To build up bones
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Detailed explanation-1: -Calcitonin is a hormone that your thyroid gland makes and releases to help regulate calcium levels in your blood by decreasing it. Calcitonin opposes the actions of the parathyroid hormone, which is a hormone that increases your blood calcium levels.
Detailed explanation-2: -Also, whereas calcitonin helps lower the body’s calcium levels, PTH helps increase the body’s calcium levels.
Detailed explanation-3: -The parathyroid hormone produced by the thyroid glands helps maintain the right balance of calcium in the bloodstream and in tissues that depend on calcium for proper functioning. This is especially important for nerve and muscle function, as well as bone health.
Detailed explanation-4: -This hormone normally regulates cartilage and bone development in the fetus, but it can be over-produced by individuals who have certain types of cancer. PTHrP then acts like PTH, causing excessive bone breakdown and abnormally high blood calcium levels, called hypercalcemia of malignancy (Stewart 2002).
Detailed explanation-5: -Calcitonin reduces calcium levels in the blood by two main mechanisms: It inhibits the activity of osteoclasts, which are the cells responsible for breaking down bone. When bone is broken down, the calcium contained in the bone is released into the bloodstream.