The Excretory System
Urine for a Great Time!!!
Engage

Watch the following
video that shows
thirty-seven -year
old Dan Whitmore
who has kidney
failure. He has to
spend three days a
week attached to a
dialysis machine.
He’s on the waiting
list for a kidney
transplant.
Explore

CONSTRUCT THE URINARY SYSTEM
• You will make a model of the primary
components of their urinary system. Once
finished with this activity you will be able to
identify the structures, their functions and
order the process of the urinary system
through your model.

Kidney Filtration Simulation Activity
• This lab activity that will simulate the overall
function of the kidneys
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
Feedback System:
Temperature Regulation


How does the body keep from
overheating?
On the other hand, how does the body
keep warm?
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
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
U-shaped Tubules
(Loop of Henle)





Most of the ions and
water
All of the glucose and
amino acids
Reabsorbed into the
bloodstream
This is how the body’s
water is conserved
Homeostasis is
maintained
The Human Kidney & Nephron
Elaborate


Exocrine/Endocrine Comparison
Research ??????????
Exocrine/Endocrine System BINGO