ENDOCRINE SYSTEM
PARATHYROID
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The heart
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The thyroid
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The lungs
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The spleen
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Detailed explanation-1: -Parathyroid hormone is directly involved in the bones, kidneys, and small intestine. In the bones, PTH stimulates the release of calcium in an indirect process through osteoclasts which ultimately leads to the resorption of the bones.
Detailed explanation-2: -Parathyroid hormone is connected to blood calcium levels in the bones, intestines and kidneys. Parathyroid hormone comes from four parathyroid glands in the neck, just behind the thyroid. These glands receive feedback from blood calcium levels to determine when they need to secrete the hormone.
Detailed explanation-3: -Calcitonin is secreted by the parafollicular cells of the thyroid gland. This hormone opposes the action of the parathyroid glands by reducing the calcium level in the blood. If blood calcium becomes too high, calcitonin is secreted until calcium ion levels decrease to normal.