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. 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. 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
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. 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. 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. 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. 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. 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. 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. 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)