The excretory system removes waste from the body through the liver, kidneys, skin, lungs, and bladder. The liver produces bile to break down fats and converts ammonia to urea. The kidneys filter waste from the blood into urine. Sweat and lungs remove salt, minerals and carbon dioxide, respectively. The bladder stores urine until it is released. Cirrhosis damages the liver tissue and can render the liver useless.

1. The Excretory System
David Wu
Friday, 19 July 13

2. Overview of the
Excretory System
• The excretory system plays a vital
role in keeping the organism’s
homeostasis.
• the excretory system is in charge of
terminating liquid and gaseous waste
product, as urine, sweat and
exhalation.
Friday, 19 July 13

3. Liver
• The kidneys create an
extremely strong bile.
the bile is a toxic that
breaks down fats
eliminating all the
waste.The liver
converts the dangerous
ammonia into “urea” a
harmless fluid. It is also
the largest gland in the
body.
Friday, 19 July 13

4. Kidneys
• Liquid waste is
removed through the
body via the kidneys.
Blood that contains
water, minerals and
urea passes threw it.
The kidney then filters
all waste from the
blood into urine,
which is funneled into
the bladder.
Friday, 19 July 13

5. Skin
• The skin is important to
maintaining
Homeostasis, the skin
contains two types of
sweat glands the Eccrine
and Apocrine. Sweat
dispels salt and waste
minerals but also keeps
the body cool through
evaporation. The Eccrine Glands are
mainly found on the palms,
sole of feet and the
forehead.
Friday, 19 July 13

6. Lungs
• The lungs are also parts of the
excretory system they expel
the waste gas carbon dioxide.
When the blood returns from a
circulation around the body it
holds carbon dioxide the waste
from cells after the the oxygen
is used. The gas is released
through the mouth as
respiration.
Friday, 19 July 13

7. Bladder
• The Bladder is the tank that
holds up 600ml of urine.
When urine goes to the
bladder the muscles relax to
hold it, at the toilet though
the muscle contract and
release.
Friday, 19 July 13

8. Substances
• Urine:A the waste created from liquids. Created from the
livers powerful bile that breaks down fat which is then
filtered by the kidneys released through the urethra.
• Sweat:The minerals excreted through the eccrine and
apocrine of the skin, mainly salt but also other wastes.
• Carbon Dioxide:A gas that is produced when the cells in the
human body uses all the oxygen leaving only Carbon
Dioxide, released by the lungs to nose or mouth (known as
respiration).
Friday, 19 July 13

9. Cirrhosis of the Liver
• Damage done to the liver usually
due to Alcoholism, Hepatitis B
and Hepatitis C. Cirrhosis cause
the regenerative tissue in the
liver to become damaged by
lumps, the lumps then renders
the liver useless.This is leads to
high blood pressure. Currently
there is no medical cure/drug the
only way is to remove the
affected area or a liver
transplant.
Friday, 19 July 13