1. Excretory System

2. Excretory System Why do our bodies need to filter waste from the body?
Maintain homeostasis
Removal of harmful materials
Removal of excess fluids, chemicals, minerals, vitamins, salts, and other wastes from the blood

3. Organs of the Excretory System
Kidneys = filter
blood that has
collected wastes
from cells

4. Organs of the Excretory System
Kidneys = filter
blood that has
collected wastes
from cells
– Nephrons = filters
inside the kidneys
– Produce urine
(sterile waste fluid,
96% water)

5. Organs of the Excretory System
Ureters = tubes that
lead from each kidney to bladder

6. Organs of the Excretory System
Urinary bladder =
muscular organ that
holds urine

7. Organs of the Excretory System
Urethra = tube that carries urine from the bladder out of the
body

8. Where is urine stored until the body is ready to eliminate it?
Kidneys
Ureters
Bladder
Urethra

9. Functions of Excretory System
Rids blood of
wastes (urea)

10. Functions of Excretory System
Rids blood of
wastes (urea)
Controls blood
volume by removing
extra water
produced by cells

11. Functions of Excretory System
Rids blood of
wastes (urea)
Controls blood
volume by removing
extra water
produced by cells
Balances salts and
water so cells can function properly

12. Which is not a function of the excretory system?
Removes wastes from the blood
Removes excess water from the blood
Removes carbon dioxide from the blood
Removes excess salt from the blood

13. Other Excretory Organs
Skin = releases perspiration (water
and salts) to cool off the body

14. Other Excretory Organs
Lungs = release carbon dioxide from the body

15. Which system does not include an excretory organ?
Excretory system
Integumentary system
Cardiovascular system
Respiratory system

16. Excretory System
How did the Filter It investigation model our excretory system?
What are some advantages of the model?
What are some limitations of the model?