Excretion

• Excretion


  Excretion is the process by which waste products and non-useful materials are eliminated from organisms
• photosynthesis equation

  Carbon dioxide + water (+sunlight) glucose + oxygenOr:6CO2 + 6H2O + sunlight C6H12O6 + 6O2

  
• Humans


  As with plants, excretion in humans is the process of removing waste products made in the body. It can also be applied to the body's way of removing toxinsThere are three main products of metabolism which the body needs to remove:Carbon dioxideUreaWater
• The kidney


  We have two kidneys, each about the size of a clenched fist. They are usually surrounded by fat which helps to protect them from injury. The kidney has 2 primary functions:Excretion, ridding the body of urea, toxins and excess water.Osmoregulation, making sure that the body contains the right balance of water and dissolved salts.
• Urinary system

  
• Osmoregulation


  Osmoregulation is the control of water levels and mineral salts in the blood