1
Excretory System – Learning Outcomes
State the function of the urinary system.
Name the products of excretion.
Describe the structure of the urinary
system.
Recall that urine is stored in the bladder.
HL: Describe the function of the kidneys in
filtering the bloodstream.
HL: Describe the function of the skin in
excretion.
2
Excretion
Excretion is the removal of waste products
from the body.
The products of excretion are carbon
dioxide, water, salts, and urea.
by Jordi March i Nogué – CC-BY-SA-3.0
3
Excretory System
4
Excretory System
Carries blood from the body to the
kidneys
Removes water, salts, and urea
from blood, forming urine.
Carries filtered blood from kidneys
Renal
to heart.
Vein
Carry urine from kidneys to bladder
Ureter
Bladder Stores urine.
Urethra Carries urine from bladder to
outside the body.
Renal
Artery
Kidney
5
The Kidneys
Waste products
are removed from
the bloodstream
by filtration in the
kidneys.
The waste products
are combined to
form urine.
Urine contains
water, urea, salts.
by ThorRune – public domain
6
The Skin
 Water and salts are
excreted through
the skin as sweat.