Chapter 5: The Excretory System
Parts of the Urinary System
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Kidneys: Excrete by-products such as urea, salts and water and filtration of waste from blood
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Renal Artery: Blood enters the kidneys from here
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Renal Vein: Blood leaves the kidneys from here.
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Bladder: Where urine is stored until excretion
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Ureter: Connects kidney to bladder
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Urethra: The tube by which urine leaves the body
Notes on the Excretory System
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The body has 3 organs of excretion. The skin, kidneys and lungs
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The lungs excrete carbon dioxide and water vapour
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The kidneys excrete salt, water and urea. Another function of the kidenys are to control the amount of water in the body and filtration
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The skin excretes salt and water
What is Urine?
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Urine is a mixture of salt, water and urea
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This urea comes from the breakdown of proteins in the liver
The Kidneys
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As you know the kidneys exrete salt, water and urea
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Urea comes from the breakdown of protein in the liver
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The renal arteries carry blood away from the heart and towards the kidneys
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The renal veins carry blood away from the kidneys and into the heart