Sodium

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Basics

  • aka Na
  • Funky element

Role

  • Sodium is the major extracellular cation
  • Goes with water and maintains the volume of blood
  • Daily intake is 5 - 10g per day, mostly from table salt
  • Sodium is regulated by the kidney
  • Low blood sodium stimulates kidney angiotensin
    • This acts on the adrenal cortex to release aldosterone which increases distal tubular reabsorption of sodium in kidney

Deficiency

  • apparently never a problem
  • What about that guy on TLC's survival week who was in the jungle and lost his salt and almost DIED!?

Toxicity

  • Excessive sodium intake can be harmful for some
  • Not usually a large problem because of the excretion mechanisms

Resources