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Excretory system


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Excretory system

  2. 2. The job of the excretorysystem is to removevarious wastesproduced by the body.The removal process isknown as excretion.
  3. 3. The wastes produced bythe body : - Carbon dioxide - Water - Nitrogenous wastes - Mineral Salts: (NaCl , KSO4)
  4. 4. Ammonia Urea Uric Acid
  5. 5. Functions of Excretion1. To Regulate the chemical makeup of the blood and body fluids by removing wastes and excess materials.2. To maintain a constant body temperature by removing excess heat.
  6. 6. 3. To maintain the homeostasis (internal balance) together with the circulatory, nervous and endocrine system
  7. 7. Human Urinary SystemThe urinary system includes the - Kidneys, - Ureter, - Urinary bladder, - Urethra.
  8. 8. Functions of Kidneys•They remove the wastes of cellular metabolism from the blood.•They control the concentrations of the various substances found in the body fluids.
  9. 9. The kidneys filtermetabolic wastes andvarious othersubstances from theblood, producing urine.
  10. 10. Two tubes, theureters, carry theurine to the urinarybladder, where it isstored temporarily.
  11. 11. Another tube, theurethra, carries theurine from thebladder to theoutside of the body.
  12. 12. Structure of KidneyThe kidney is divided into three distinct regions.•The outermost region is the cortex,•the middle region is the medulla, and•the inner region is the pelvis.
  13. 13. The filtering of the bloodoccurs in the cortex;The medulla consists ofcollecting ducts that carry theurine; andThe pelvis is a cavityconnected to the ureter, intowhich the urine drains
  14. 14. Structure of Nephron•The functional units of the kidneys are the nephrons.•A cluster of Blood capillaries, the glomerulus,•It is surrounded by Bowmans capsule.
  15. 15. Four functions of the kidney
  16. 16. - proximalconvoluted tubule- loop of Henle- distal convolutedtubule- collecting duct
  17. 17. A Nephron
  18. 18. Blood enters the kidneysthrough the renalarteries.It leaves the kidneysthrough the renal veins.
  19. 19. MEIOSIS
  20. 20. QUIZ
  21. 21. 1.What is the job of excretory system?
  22. 22. 2.What are the functions of excretory system?
  23. 23. 3. What are the metabolic wastes?
  24. 24. 4. What are the excretory organs in human body?
  25. 25. 5. List the parts of human urinary system?
  26. 26. 6. List the three parts of kidneys
  27. 27. 7.Which part of kidney is the functional unit
  28. 28. 8. Describe the structure of a nephron
  29. 29. Cytokinesis
  30. 30. giSev i es mKü Pinar