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Presentation on theme: "Excretory System http://commons.wikimedia.org/wiki/File:Illu_urinary_system_numbers.svg."— Presentation transcript:

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?


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