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十四 钠的定量法 钠是血浆中主要的正离子,在100毫升血浆中含有310—350毫克钠。主要以NaCl及NaHCO_3形式存在。钠的功能是维持血浆一定的渗透压;以重碳酸盐形式存在的钠,又系血液中缓冲体内所产生酸的最主要物质。因此,在调节体内酸碱平衡,在一定程度内保持血液pH的恒定上,钠也起了重要的作用,此外钠能使组织(如肌肉)激动性增加,此点适与钙相反。体内所需要的钠主要来自食盐。钠的吸收
Fourteen Sodium Quantification Sodium is the main positive ion in plasma and contains 310-350 mg of sodium in 100 ml of plasma. Mainly in the form of NaCl and NaHCO3. The function of sodium is to maintain a certain osmotic pressure in plasma; sodium, which exists in the form of bicarbonate, is the main substance of the acid produced in the blood in the buffer. Therefore, sodium also plays an important role in regulating the acid-base balance in the body and maintaining the pH of the blood to a certain extent. In addition, sodium can increase the agitation of tissues (such as muscles), which is the opposite of calcium. The sodium needed in the body comes mainly from salt. Absorption of sodium