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第四章镁镁在维持肌肉正常收缩和神经组织的兴奋上是一个重要的因素,是许多与能量储存、转送和利用有关的酶催化作用所需要的。—70公斤重的成年男人其镁含量约为2,000毫当量(21至28克或1,750至2,333毫当量;Widdowson等,1951)。这些镁大约半量在骨中,其余几乎全部在软组织的细胞中。细胞外液中的镁不到1％。英国人日常膳食中约有镁20至25毫当量,其中8毫当量被吸收。在成人每天有8毫当量的镁随尿排出(macintyre,1963)。通常,镁与钙、
Chapter 4 Magnesium Magnesium is an important factor in the maintenance of normal muscle contraction and excitability of nerve tissue and is required for many enzymatic catalysis related to energy storage, transfer and utilization. Adult males weighing about 70 kg have a magnesium content of about 2,000 milliequivalents (21 to 28 grams or 1,750 to 2,333 milliequivalents; Widdowson et al., 1951). About half of these magnesium in bone, the rest almost all in soft tissue cells. Magnesium in extracellular fluid is less than 1%. The British diet contains about 20 to 25 milli equivalents of magnesium, of which 8 milli equivalents are absorbed. In adults, 8 milli equivalents of magnesium are excreted with urine (macintyre, 1963). Usually, magnesium and calcium,