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FUNCTIONING ORGANISMS.
05. Excretory system.
Ian Anderson
Saint Ignatius College Geelong
EXCRETORY SYSTEM.
 Responsible for
 Processing and elimination of
metabolic wastes.
 CO2 is excreted through your lungs...
EXCRETORY SYSTEM.
 As our cells undergo their many metabolic
processes, harmful wastes are continually being
produced.
 ...
EXCRETORY SYSTEM.
 Faeces is waste from your digestive system,
however it is not metabolic waste and therefore its
remova...
EXCRETORY SYSTEM.
The organs of excretion are the:
 Lungs.
 Skin.
 Liver.
 Kidneys.
EXCRETORY SYSTEM.
The lungs.
 Releases CO2 into the air from
the bloodstream.
 CO2 is a waste product of
cellular respir...
EXCRETORY SYSTEM.
The skin.
 Sweat is a mixture of three
metabolic wastes.
 Water, salts & urea.
 Sweat has a cooling e...
EXCRETORY SYSTEM.
The liver.
 Has several functions (not all
are involved with excretion).
 Breaks down protein waste
pr...
EXCRETORY SYSTEM.
The kidneys.
 The primary organ of the
urinary system.
 Urinary system is made up of:
 Kidneys.
 Ure...
EXCRETORY SYSTEM.
The kidneys.
 Made of ~2.4 million
tiny structures
called nephrons.
 Each nephron is a
filtering machi...
EXCRETORY SYSTEM.
The nephron.
 Blood is pumped into
kidneys and forced
under pressure via specialised
capillaries
called...
EXCRETORY SYSTEM.
The nephron.
 The filtrate then travels
through the
proximal tubules
and Loop of Henlé
where wanted
sub...
EXCRETORY SYSTEM.
The kidneys.
 Once urine leaves the kidney it
enters the ureter and travels to
the bladder, where it is...
BIBLIOGRAPHY.
Sharwood, J. (Ed.). (2005). Science Edge 2.
Melbourne: Thomson Learning.
http://sickscience8.wikispaces.com/
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Functioning Organisms - 05 The Excretory System

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A closer look at the excretory system for Year 8 Science students at Saint Ignatius College Geelong.

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Functioning Organisms - 05 The Excretory System

  1. 1. FUNCTIONING ORGANISMS. 05. Excretory system. Ian Anderson Saint Ignatius College Geelong
  2. 2. EXCRETORY SYSTEM.  Responsible for  Processing and elimination of metabolic wastes.  CO2 is excreted through your lungs.  Urea & salts are excreted by your kidneys and removed from your body as urine.  Controls amount of water in our body. Source: http://www.cakechooser.com/
  3. 3. EXCRETORY SYSTEM.  As our cells undergo their many metabolic processes, harmful wastes are continually being produced.  Metabolic wastes include CO2, urea, salts, water, etc.  These wastes must be collected and removed before they increase in concentration to poisonous levels.  The process of removing these metabolic wastes is called excretion.
  4. 4. EXCRETORY SYSTEM.  Faeces is waste from your digestive system, however it is not metabolic waste and therefore its removal is not excretion.  Faeces is undigested food that your body has not been able to process.  Removing digestive wastes is called egestion. Source: http://flickrhivemind.net/Tags/diarrhea/Timeline
  5. 5. EXCRETORY SYSTEM. The organs of excretion are the:  Lungs.  Skin.  Liver.  Kidneys.
  6. 6. EXCRETORY SYSTEM. The lungs.  Releases CO2 into the air from the bloodstream.  CO2 is a waste product of cellular respiration that occurs in all our cells.  Our blood collects CO2 from our cells and transports it to our lungs where it diffuses into the alveoli and is then breathed out. Source: http://www.uic.edu/classes/bios/bios100/lecturesf04am/lect20.htm
  7. 7. EXCRETORY SYSTEM. The skin.  Sweat is a mixture of three metabolic wastes.  Water, salts & urea.  Sweat has a cooling effect on your body (evaporative cooling). Source: http://www.youtube.com/watch?v=RJItaB8M24c
  8. 8. EXCRETORY SYSTEM. The liver.  Has several functions (not all are involved with excretion).  Breaks down protein waste products into urea.  Detoxifies blood (e.g. alcohol).  Breaks down old red blood cells.  Stores glucose as glycogen.  Produces bile. Source: http://11uexcretorysystem.wordpress.com/
  9. 9. EXCRETORY SYSTEM. The kidneys.  The primary organ of the urinary system.  Urinary system is made up of:  Kidneys.  Ureters.  Bladder.  Urethra. Source: Sharwood (2005)
  10. 10. EXCRETORY SYSTEM. The kidneys.  Made of ~2.4 million tiny structures called nephrons.  Each nephron is a filtering machine. Source: http://www.beltina.org/health-dictionary/nephron- function-kidney-definition.html
  11. 11. EXCRETORY SYSTEM. The nephron.  Blood is pumped into kidneys and forced under pressure via specialised capillaries called a glomerulus into the Bowman’s capsule. Source: http://www.beltina.org/health-dictionary/nephron- function-kidney-definition.html
  12. 12. EXCRETORY SYSTEM. The nephron.  The filtrate then travels through the proximal tubules and Loop of Henlé where wanted substances such as glucose, vitamins, minerals and water are reabsorbed into the bloodstream.  The filtered waste (now called urine) then leaves the kidney and moves into ureter. Source: http://www.beltina.org/health-dictionary/nephron- function-kidney-definition.html
  13. 13. EXCRETORY SYSTEM. The kidneys.  Once urine leaves the kidney it enters the ureter and travels to the bladder, where it is stored.  Urine then travels through the urethra out of the body when your urinate. Source: Sharwood (2005)
  14. 14. BIBLIOGRAPHY. Sharwood, J. (Ed.). (2005). Science Edge 2. Melbourne: Thomson Learning.
  15. 15. http://sickscience8.wikispaces.com/

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