The urinary/excretory system filters waste from the blood and removes toxins from the body. The kidneys filter waste products from the bloodstream and produce urine, which is stored in the bladder and then expelled. The system works with other body systems to both remove waste and regulate water and salt levels in the body. It can also cool the body through sweating and excreting waste through pores in the skin.

1. Urinary/Excretory
System
Besides getting rid of wastes and
filtering toxins out of the blood, it
also…..

2. Urinary/Excretory System
 Works closely with the digestive,
circulatory and nervous systems.
 As the heart pumps blood around the
body, the blood carries fresh oxygen to
various cells and organs, then picks up
waste products like carbon dioxide, salt
and urea.
 There is an artery and a vein that runs
into and out of each kidney to take the
blood there and back.

3.  As the waste products arrive, the kidneys
perform a filtration process that removes
hazardous toxins and products that the
body can not use from water and nutrients
that can be reclaimed and recycled.
 The kidneys return the reclaimed water
back to the body, but mix the waste
products into a liquid waste compound
known as urine.

4.  The kidneys direct the urine to the
bladder, where it is collected and held
until it is either manually expelled or
forced out by involuntary muscle
contractions.

5.  The excretory system takes advantage of
sweating by providing waste liquids to
accomplish the cooling effect.
 Sweat is not pure water; instead, it is a
solution of approximately 94 percent
water and six percent waste products.
 By excreting weak urine through the skin's
pores, the excretory system can perform
the dual functions of ridding the body of
waste products while also keeping it cool.

6. Urinary/Excretory System
 Kidneys - Controls amount of water and
salt in body with the following feedback
loop:
 If too low, retains water/salt and keeps them
from going to the bladder
 If too high, pushes more water and salt into
the bladder

7. Diseases/afflictions of the
urinary/excretory system
 Diarrhea
 UTI infection
 Colon Cancer
 Constipation
 Kidney stone
 Flatulence
 incontinence

8. Activity
 Data Lab: Urinalysis