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Page history last edited by Jay 10 years, 10 months ago


  1. Reference
  2. Describe role of cell in blood
    • the blood plasma helps to know which higher molecular weight settle at the bottom rbc while the lighter plasma rises to the top.
  3. Structural features
    • cells suspended in plasma (see other presentations)
    • 90% water
      • water is less dense than erythrocyte or leukocyte
    • electrolytes (inorganic, molecules or atoms that do not contain carbon,  salts
      • Na+ or K+ or Cl-
    • buffers (molecules)
    • proteins (like enzymes, albumin etc.)
  4. Relate structural features to functions
    • Water molecule is polar
      • polar "sticks" to ions, therefore ions dissolve well in water
      • polar molecules form H-bonds, therefore dissolve CHO and proteins
    • Electrolytes (sodium and chloride)
      • with maintain osmotic balance of the blood by controlling movement of the water
        • diffusion
        • osmosis
      • Ions controlled nerve impulses and mucscle movement.
    • Buffer controls the ph of the blood in human body (at about pH = 7.4)
      • give up H+ (if it is basic ~ 7-14) and they take H+ (if it is too acidic ~ 1-7)
    • proteins
      • keep water concentration balances present in blood
      • some are chemical signals (to help blood clot)











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