2.70 describe the structure of the urinary system, including the kidneys, ureters, bladder and urethra


  1. Glomerular filtrate filters blood to produce glomerular filtrate. Glomerular filtrate contains water, salt, urea and glucose. Protein does not enter because the molecule is too large to fit through capillary walls
  2. Bowman’s capsule collects the filtrate. It enters the tubules and the glucose is immediately re-absorbed into the blood capillaries
  3. Rest of the filtrate travels through the tubules. Salt and water required by the body is reabsorbed by the capillaries
  4. The Loop of Henlé helps to maintain the correct water balance in the body by filtering out excess salts
  5. Waste (excess water salts and urea) is excreted as urine through the collecting duct, the bladder stores the urine until the body can expel it through the urethra.

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