- The urea contains nitrogen which is toxic to the body and cannot be stored.
- The original form of nitrogen are amino acids.
- Blood circulates into the liver and breaks down, and it is converted into Urea.
- It re-enters the blood stream and circulates to both kidneys.
- The kidneys filter the urea from the blood and will be added to water to form urine.
Sunday, October 30, 2011
2.68a Excretion
2.67b Human organs of Excretion
- The lungs excrete carbon dioxide through respiration.
- The kidneys excrete H20, Urea and Salts.
- Skin excretes water and salt through the process of sweating and also abit of Urea.
2.67a Excretion in plants
- Photosynthesis happens when a leaf absorbs light energy and in this process it combines CO2 with water to form glucose and oxygen which are given off as waste molecules.
- CO2 + H2O ---> C6H12oO6 + O2 -> Excretion
- Glucose and Oxygen happen through enzyme reactions, the glucose is broken down and forms ATP.
- Carbon dioxide is a metabolic waste and is excreted.
- C6H12oO6 + O2 ---> ATP + H2O + H2O -> Respiration
- Glucose molecule are broken down and energy is used to form ATP and get the waste of carbon dioxide and water to be given off.
- This waste process is called Excretion.
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