1 / 18

Excretion

Excretion. Human Excretion. Excretion – process of removing waste substances produce by the metabolic processes from the body . Waste substance left in the body and not removed will become toxic and poison . Excretory organs – skin, lungs, kidneys

kynton
Download Presentation

Excretion

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Excretion

  2. Human Excretion • Excretion – process of removing waste substances produce by the metabolic processes from the body. • Waste substance left in the body and not removed will become toxic and poison. • Excretory organs – skin, lungs, kidneys • Excretory substances – water, carbon dioxide, urea, excess mineral salts.

  3. Human Excretion (cont’d)

  4. Human Excretion (cont’d) • Importance of excretion • Disposal of toxic or poisonous substances e.g urea • Disposal of excess subtances e.g salts and water

  5. Urinary system

  6. Urinary system

  7. Urinary system (cont’d) • Human kidney • Dark red, broad bean-shaped organ • Located at the back of the abdomen • Parts : • Cortex – lighter outer region • Medulla – darker inner region • Pelvis – central cavity • Ureter – connects the pelvis to the bladder

  8. Urinary system (cont’d) • Function of the kidneys • Remove nitrogenous waste products e.g urea • Balance the water and mineral contents • Maintain the pH of the blood and tissue fluid

  9. Urinary system (cont’d) • Ways to maintaining healthy kidneys: • Taking urine and blood test • Limit protein and salt intake • Maintaining blood sugar control (for diabetics) • Drink, at least 8 glass of water per day • Learn about symptoms of kidney failure

  10. Urinary system (cont’d) • Living with kidney failure • Human can survive with one healthy kidney • Cause of kidney failure : • Bacterial infection • Injury • High blood pressure • Two ways to treat kidney failure • Haemodialysis • Kidney transplant

  11. Urinary system (cont’d) • Haemodialysis • Dialysis machine works in similar to kidney • Blood is withdrawn and circulated through the machine • Blood flows through a dialysis tube, surrounded by dialysing solution

  12. Urinary system (cont’d) • Haemodialysis (cont’d) • Urea and excess salts diffuse into the dialysing solution • Used dialysing solution is discarded

  13. Urinary system (cont’d) • Kidney transplant • The kidney of donor should be match to the patient

  14. Excretion in plants • Plants • produce relatively small amount of waste products. • less active – accumulate waste slowly • Do not have specialised excretory organs

  15. Excretion in plants (cont’d) • Some other waste products • Latex, resins, gum • Stored in plants and released when the plants die and decay • Some are useful to humans • Latex – manufacturing • Resins – paint industry

More Related