Water

• What are the functions of blood?

  • Transport
  • Immunity/defence
  • Thermoregulation
  • Maintaining pH of bodily fluids
• What is the composition of blood plasma?

  • Water - 92%
  • Proteins- fibrinogen, albumin, antibodies
  • Ions- Na+, K+, Ca2+, Cl-
  • Waste products- urea
  • Nutrients- glucose, amino acids, fatty acids
  • Hormones- testosterone, oestrogen
  • Gases- O2 and CO2
• What is the composition of cells in the blood?

  • Erythrocytes (red blood cells)4-6 million per mm3
  • Leukocytes (white blood cells) 4000-11000 per mm3
  • Thrombocytes (platelets) 200000-500000 per mm3
• What are the charges on a water molecule?

  O atom with a slight negative charge and 2 H atoms with a slight positive charge
• What bonds does water form with other polar molecules?

  Hydrogen bonds
• What ae the traits of water?

  • Good solvent
  • High specific heat capacity
  • High tension
• Why is water a good solvent?


  It is dipolar so it attracts and dissolves other polar molecules
• Why does water have a high SHC?


  The hydrogen bonds inbetween molecules require lots of energy to break
• Why is waters high SHC a useful feature?


  It helps keep body temperature stable
• Why does water have high tension and cohesion?

  Although hydrogen bonds are weak, there are many which causes molecules to hold together and binds to other surfaces