1. Sodium: osmosis, salt and water balance, membrane permeability, muscle irritability. Aldosterone enhances, ANF inhibits its intake. It causes persistent sweating. An overdose causes oedema and hypertension
  2. Potassium: is eliminated by the renin-angiotensin system. The lack of sustained vomiting occurs after diarrhoea, diabetes mellitus. It may cause heart attacks
  3. Calcium: 1.5-2% of body weight, bones, teeth, muscle contraction, blood clotting, a secondary messenger
  4. Vitamin D,

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