Excretory System http://commons.wikimedia.org/wiki/File:Illu_urinary_system_numbers.svg

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

Organs of the Excretory System Kidneys = filter blood that has collected wastes from cells http://commons.wikimedia.org/wiki/File:Illu_urinary_system.jpg

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) http://commons.wikimedia.org/wiki/File:Illu_urinary_system.jpg

Organs of the Excretory System Ureters = tubes that lead from each kidney to bladder http://commons.wikimedia.org/wiki/File:Illu_urinary_system.jpg

Organs of the Excretory System Urinary bladder = muscular organ that holds urine http://commons.wikimedia.org/wiki/File:Illu_urinary_system.jpg

Organs of the Excretory System Urethra = tube that carries urine from the bladder out of the body http://commons.wikimedia.org/wiki/File:Illu_urinary_system.jpg

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

Functions of Excretory System Rids blood of wastes (urea) http://commons.wikimedia.org/wiki/File:Illu_urinary_system.jpg

Functions of Excretory System Rids blood of wastes (urea) Controls blood volume by removing extra water produced by cells http://commons.wikimedia.org/wiki/File:Illu_urinary_system.jpg

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 http://commons.wikimedia.org/wiki/File:Illu_urinary_system.jpg

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

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

Other Excretory Organs Lungs = release carbon dioxide from the body

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

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?