How Our Body Eliminates Waste and keeps us
healthy!
Excretory System = Urinary System
Function:
Removes or excretes excess water, H2O, urea,
carbon dioxide, CO2, and other wastes from our
blood.
Importance:
Harmful chemicals made when the body creates
energy must be removed from blood to keep you
healthy

Kidneys – filter out excess water, salt and
chemicals as urine

Lungs – filter out carbon dioxide, CO2, from
the blood. (respiratory system)

Skin – excretes water, as sweat, which
contains some trace chemical wastes,
including urea. (epidermis)
Liquid waste = urine

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Artery
Kidney
Vein
Ureter
Urinary Bladder
Urethra
Kidney
Ureters
Urinary BLADDER
Urethra
K Ureter B Urethra
Kidneys
Function - filter wastes and excess water from the blood.
Importance – control the amount of water in body, tell
body when to make new red blood cells, take harmful
chemicals from blood
Other Info – located in back under ribs
You have 2 kidneys, but can live with 1
Picture
Ureter
Function - tubes that take urine from the kidney to the
urinary bladder.
Importance – after the waste is filtered from blood, it must
go to the bladder for storage
Other Info – each kidney has its own ureter
Picture
Urinary Bladder
Function: a sack that stores
urine/liquid waste
Importance: Holds urine until you go
to the bathroom
Other Info: when full, a message is
sent to your brain telling you to go
to the bathroom
Picture
Urethra
Function- small tube that carries urine out of
the body.
Importance – connects the bladder to the
outside of the body, how urine leave body
Other Info – about 6mm wide
Picture

Tiny tubes in the kidneys that filter and clean
blood and balance supply of water and salt.
(about 1 million per kidney)
1.
2.
3.
The ______________ filter waste and excess
water from the blood.
The tube that carries urine out of the body
is called the _____________.
The urinary bladder stores ____________
until it is ready to exit the body.

http://www.whyzz.com/why-is-pee-yellow

http://kidshealth.org/kid/htbw/pee.html
Doctors analyze urine for disease;



Normal urine contains water, urea and
trace minerals.
Sugar in urine indicates Diabetes
Protein in urine indicates the kidneys are
not working and the person, or animal,
is very sick.
1.
2.
3.
4.
5.
6.
7.
8.
9.
Excretory System
Lungs
Skin
Kidneys
Urine
Nephrons
Ureter
Bladder
Urethra

HW review
Removes Water = Kidneys, Skin
Brings Oxygen to blood = Lungs
Removes Salt = Kidneys, Skin
Stores Urine = Bladder
Removes C02 = Lungs
Produces Urine = Kidneys
Removes Body Heat = Skin
Today’s Goal
-
-
To memorize the functions and order of the
Kidneys, Ureter, Bladder and Urethra
To learn the difference between URETER and
URETHRA
1.
2.
3.
What are the tubes that carry urine from the
kidneys to the bladder called?
The __________ is the tube that carries urine
out of the body.
What is the job of the kidneys?