Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

The excretory system

3,724 views

Published on

Excretory system.

Published in: Education
  • Be the first to comment

  • Be the first to like this

The excretory system

  1. 1. Unit 3(D): The excretory system.
  2. 2. HOW WE PERFORM EXCRETION We excrete ………….. through our lungs. We excrete the residues of ……… through the anus. To excrete other substances we use our urinary system and sweat glands.
  3. 3. HOW WE PERFORM EXCRETION We excrete carbon dioxide through our lungs. We excrete the residues of the food through the anus. To excrete other substances we use our urinary system and sweat glands.
  4. 4. EXCRETION is the expulsion of residues.
  5. 5.  We expel residues : in URINE, through the urinary system in SWEAT through the sweat glands.
  6. 6. Organs of the Human Urinary System 1. THE KIDNEYS are organs which filter the 1. THE KIDNEYS are organs which filter the blood. They extract toxic substances and blood. They extract toxic substances and form urine. form urine.
  7. 7. 2.-THE URINARY TRACT is the tube through which urine flows out of our bodies. It includes:  THE URETERS  THE BLADDER  THE URETHRA
  8. 8. THE RENAL VEINS AND THE RENAL ARTERIES.
  9. 9. HOW THE URINARY SYSTEM WORKS →Blood containing residues flows to the KIDNEYS through the RENAL ARTERIES. →Each KIDNEY filters the blood and extracts waste products. →The clean blood returns to the body through the RENAL VEINS. →The residues are mixed with water to form urine which flows out of the KIDNEYS through the URETERS. It collects in the BLADDER. →When the BLADDER is full we expel the urine through the URETHRA.
  10. 10. Dialysis
  11. 11. EXCRETION THROUGH THE SKIN OUR SKIN has million of SWEAT GLANDS which produce sweat. 1.- Blood filled with waste products flows to the sweat glands through capillaries. 2.- The sweat glands filter the residues, mix them with water and expel them as sweat through the pores in the skin. 3.- The clean blood retursn to the body through the capillaries.
  12. 12. SWEAT GLAND

×