3. Constituents of Extracellular and Intracellular fluids

Cards (17)

  • What separates plasma from interstitial fluid?
    Highly permeable capillary membranes
  • What is the main difference between plasma and interstitial fluid?
    Higher concentration of protein in plasma
  • Why do only small amounts of proteins leak into interstitial spaces?
    Capillaries have low permeability to proteins
  • What effect increases cation concentration in plasma?
    Donnan effect
  • How much greater is the cation concentration in plasma compared to interstitial fluid?
    About 2 percent greater
  • Why do plasma proteins hold extra cations in plasma?
    They have a net negative charge
  • Where is the concentration of anions slightly higher?
    In the interstitial fluid
  • What ions are found in large amounts in extracellular fluid?
    Sodium and chloride ions
  • What regulates the composition of extracellular fluid?
    The kidneys
  • Why is the regulation of extracellular fluid important?
    To maintain proper electrolyte and nutrient concentration
  • What separates intracellular fluid from extracellular fluid?
    A cell membrane
  • What is the permeability of the cell membrane to water?
    Highly permeable
  • What ions are present in small quantities in intracellular fluid?
    Sodium and chloride ions
  • What ions are found in large amounts in intracellular fluid?
    Potassium and phosphate ions
  • How much protein is found in intracellular fluid compared to plasma?
    Almost four times as much
  • What is the concentration of calcium ions in intracellular fluid?
    Almost none
  • What is the concentration of magnesium and sulfate ions in intracellular fluid?
    Moderate quantities