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THE EXCRETORY SYSTEM Getting Rid of Wastes Urine, blood, kidneys, quarter, urea, urethra, bladder, process, unwanted, organs, lungs, urination, excretion, urine, liver, bladder, Kidneys, blood, heart, toxic, ureters, urine, kidneys Excretion may be defined as any process that gets rid of unwanted products or wastes from the body. The main organs involved in human excretion are the lungs, the liver and the _kidneys. If you put your hands on your hips your kidneys are close to where your thumbs are. You have two of these reddish brown, bean-shaped organs. Kidneys play an important role in filtering your blood. About a quarter of the blood that your heart pumps is sent to your kidneys. These organs filter about 50 litres of blood each hour. Your kidneys remove waste products of chemical reactions, like urea, from your blood. Accumulation of these substances would otherwise be toxic or dangerous to your body. Other substances like salts and water can also be removed if they are in excess. Urine is produced by your kidneys. This watery fluid contains unwanted substances. Tubes called ureters transport urine from your kidneys to your bladder to be temporarily stored. As it fills, your bladder expands like a balloon. It can hold about 400ml of urine. Urination occurs when urine moves from your bladder through a tube called the urethra_ and out of your body. BLOOD, WATER AND URINE Look at the table below showing a comparison between the substances in the blood and in the urine. Construct a column graph to compare the quantity of the substances in the blood and in the urine. Substance Water Proteins Glucose Chloride (salt) Urea Blue = blood Orange = urine Quantity In Blood 92 7 0.1 0.37 0.03 In Urine 95 0 0 0.6 2 THE EXCRETORY SYSTEM . Label the diagram below of the excretory system and kidney. kidney ureter bladder urethra POSITIONING THE EXCRETORY SYSTEM In the diagram below draw the excretory system into the human torso below, making sure you have drawn in the correct position.