The Excretory System
Urine for a Great Time!!!
Explain


Contributing Excretory Organs
Liver
•
•



removes hazardous chemicals from the blood.
•
•
"detoxifies" the blood
For this reason, alcoholics and other types of addicts have a
higher incidence of liver disease.
Some proteins & other nitrogenous compounds are broken
down in the liver forming a compound call urea
Lungs
•
excrete waste like carbon dioxide and water.
Skin
• rids waste from the body through sweat glands
Kidneys
“Homeostasis”:
Regulation of the body

What factors in the body can you think of
that might change?
-
pH
Levels of various solutes and wastes
Water level
-

How would the body keep itself safe
from these changes?
Engage

Watch the following
video that shows
twenty-three years
old Iyanti Browne
who has kidney
failure. She has to
spend three days a
week attached to a
dialysis machine for
three hours at a
time.
Primary Urinary Organs





2 Kidneys
•
•
•
Renal cortex (outer region)
Renal medulla (inner region)
Nephron: functional unit of
kidney
Renal artery/vein: kidney blood
flow
2- Ureters: urine excretory duct
1 - Urinary bladder: urine
storage
1 - Urethra: urine elimination
tube
Kidneys


Two reddish organs just above the waist
behind the stomach
Filter the blood and removes waste
Ureter

Connects the kidneys to the urinary
bladder
Urinary Bladder


Smooth muscle bag
Stores waste solution - urine
Urethra


Connects bladder to outside of the body
Allows urine to pass out of the body
In the next episode…
Nephron



Filtering unit of the
kidney
Blood enters full of
waste and leaves
filtered
Blood enters under
high pressure and
flows into the
capillary beds
Have a go yourself
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