The Excretory System

• Excretion


  Removal of waste from the body
• Excretory System


  The system responsible for removing waste from the body
• Urinary System


  1. Kidney

  2. Ureter

  3. Urinary bladder

  4. Urethra

  
• Kidney


  • Cleanse blood

  
• Ureter


  • Tube where urine passes to the bladder
• Urinary bladder


  • Stores urine

  
• Urethra


  • Carries urine to the outside of the body
• Renal Circulation


  Blood flow through the kidneys

  
• Nephron


  • Consists of renal tubule, glomerulus & Bowman's capsule

  
• Glomerulus


  • Cluster of capillaries with holes in wall
• Bowman's Capsule


  • Collects substances that escaped in glomerulus
• Renal Tubule


  • A long thin tube
  • Reabsorption - return of all useful substances
  • Urine - Waste product

  
• Renin


  Enzyme to increase blood pressure
• Anti-diuretic hormone


  Regulates water absorption
• Suppresses ADH


  Dehydration
• Alcoholic drinks & Caffeine

  Stimulates ADH
• Nicotine


  Kidney stones
• Urinary tract infection (UTI)

  Infection of kidney & ureter, or bladder & urethra

  
• Dialysis


  Process of separating different sizes of molecules using membranes