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Excretory system

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A CAPS-aligned overview of the excretory system for grade 9's.

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Excretory system

  1. 1. Excretory system
  2. 2. Most important processes Filtration Absorption Distribution Excretion
  3. 3. Urinarysystem Kidneys Aorta and renal artery Vena cava inferior and renal vein Urine tube - Ureter Bladder Urethra
  4. 4. Bean shaped Approximately the size of a fist, and protected by a fatty layer. Situated in the abdominal cavity, under the diaphragm, either side of the spine. Right is slightly lower than left.
  5. 5. Functionofkidneys Excrete waste products Regulate water in the blood and tissue fluid. Regulate acid and mineral salts to ensure the body does not have a surplus.
  6. 6. Filtration Re-absorption Formation of Urine Blood is filtered and waste products (urea) are removed from the blood. Water, salts and other substances are re- absorbed. The water that is not re-absorbed, keeps the waste products in solution to be excreted later. Blood is filtered and waste products (urea) are removed from the blood.
  7. 7. Ureter • The two tubes that transport urine from the kidneys to the bladder Bladder • The bladder stores urine before it is excreted after a period of time. Urethra • Transports urine from the bladder out of the body.
  8. 8. Title slide: http://www.drugrehabfl.net/wp-content/uploads/2012/11/kidneys.jpg Slide 3: http://www.pharmaworld.pk/products/gallery/gal919_t65.jpg Slide 4: http://www.apsubiology.org/anatomy/2020/2020_Exam_Reviews/Exam_4/kidney%20anatomy.jpg Slide 6: Nephron: https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcS1iYFwxyh0hPL- NgaamLymga2jRKGe57lsWNlnhd-zGresPWBt Glomeruli: https://encrypted- tbn3.gstatic.com/images?q=tbn:ANd9GcRE8Q7l-FSHxARzZRcuwrJn0npzdKOX5F_JemfaL8G2AkAkhRb2 Urinalysis: https://classconnection.s3.amazonaws.com/588/flashcards/2797588/jpg/tripphos-144F2341C152AF08538.jpg Slide 7: http://www.amharicdrama.com/wp- content/uploads/2015/06/princ_rm_photo_of_urinary_tract_infection-300x335.jpg TEXT: du Plessis et al: DocScientia Textbook and Workbook Grade 9 Natural Sciences CAPS; 2013 info@docscientia.co.za

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