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词汇 Calcium metabolism
分类 英语词汇 英语翻译词典
释义

Calcium metabolism

英语百科

Calcium metabolism

A diagrammatic representation of the movements of calcium ions into and out of the blood plasma (the central square labeled PLASMA Ca2+) in an adult in calcium balance. The widths of the arrows indicating movement into and out of the plasma are roughly in proportion to the daily amounts of calcium moved in the indicated directions. The size of the central square in not in proportion to the size of the diagrammatic bone, which represents the calcium present in the skeleton, and contains approximately 25,000 mmol (or 1 kg) of calcium compared to the 9 mmol (360 mg) dissolved in the blood plasma. The various colored arrows indicate where the different hormones act, and their effects when their plasma levels are high. PTH is parathyroid hormone, 1,25 OH VIT D3 is calcitriol or 1,25 dihydroxyvitamin D3, and CALCITONIN is a hormone secreted by the thyroid gland when the plasma ionized calcium level is high or rising. The diagram does not show the extremely small amounts of calcium that move into and out of the cells of the body, nor does it indicate the calcium that is bound to the extracellular proteins (in particular the plasma proteins) or to plasma phosphate.[1][3][18][21][22]
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