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正常成人體內含鉀約175克,其中98%的鉀以鉀離子的形式貯存于細胞液內;血清正常指標含鉀3.5~5.5mmol/L。鉀是細胞內最主要的陽離子之 一。

鉀可以調節細胞內適宜的滲透壓和體液的酸堿平衡,參與細胞內糖和蛋白質的代謝。有助于維持神經健康、心跳規律正常,可以預防中風,并協助肌肉正常收縮。在攝入高鈉而導致高血壓時,鉀具有降血壓作用。

含鉀量比較高的蔬菜有菠菜,還有香菜、油 菜、甘藍,還有芹菜、大蔥、萵筍、土豆、山藥、 毛豆等。

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