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Flashcards in Water and Electrolyte Homeostasis Deck (5)
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1

THE INTERNAL ENVIRONMENT

- The constancy of the internal environment is the prerequisite for life
- The internal environment is made up of the body fluids (intracellular fluid and extracellular fluid)
- Exchange between the fluid compartments is occurring continuously

2

ALDOSTERONE

- Corticosteroid hormone synthesised in and secreted from the adrenal glands cortex
- Secretion increases in response to either;
- A decrease in blood pressure (renin- angiotensin- aldosterone system)
- An increase in blood K+ levels
- Aldosterone drives Na+ reabsorption in exchange for K+
- Water re-uptake will also occur along an established osmotic gradient

3

ELECTROLYTE: SODIUM

- Regulation linked with water balance
- High blood sodium= lower body water
- Low blood sodium= high body water

4

ELECTROLYTE: POTASSIUM

Regulation by removal of excess blood potassium by renal secretion

5

ELECTROLYTE: PHOSPHATES

“Overflow mechanism” if blood phosphorus level is higher than the capacity of the kidneys to reabsorb phosphate→ the excess is lost in the urine