excretion

• it is the removal of excess materials, waste materials and toxic materials for the body
• the skin excretes:

  • excess water
  • excess salts
• the lungs excretes:

  • co2
  • water vapour
• the liver excretes:

  • excess amino acids
  • drugs/toxins
• deamination is the process by which amino acids are broken down into urea
• metabolic wastes are the waste products of digestion
• lungs, skin, liver and kidney are all excretory organs
• co2 needs to be removed from the body because it will dissolve int the water in blood and increase the ph of blood or make the blood acidic