kidneys and urea

HideShow resource information
View mindmap
  • kidneys
    • are excretion organs
    • blood is carried to the kidneys by renal arteries
    • the clean blood leaves the kidneys by the renal veins
    • they perform 3 main roles: removal of urea, adjustment of ion levels and adjustment of water content
    • kidneys can stop working because of infections
      • if the kidney does stop working then you can have a kidney donor or start dialysis
    • nephrons are the filtration units in the kidney
      • ultrafiltration
        • a high pressure is built up this  squeezes water, urea, ions and glucose out of the blood and into the bowman's capsule
      • reabsorption
        • as the liquid flows along the nephron, useful substances are rebsorbed for example glucose and sufficient water
    • kidneys regulate water content
      • done by negative feedback
      • the amount of water reabsorbed in the kidney nephrons is controlled by anti-diuretic hormone(ADH)
    • Urea
      • is poisonous
      • filtered out of the blood to make urine
      • is produced by the liver from excess amino acids


No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Cells, tissues and organs resources »