Excretory System Any system that eliminates wastes
Included in excretory system are: Digestive-water and undigested food out Respiratory- carbon dioxide and water out Skin (Integumentary)- sweat and salts out Urinary-water, metabolic wastes and salts out
Urinary System: Function It filters your blood and removes wastes produced by your cells Fluid levels in the body are also maintained by the urinary system
Organs: Kidneys (2) Filters all the blood in your body every 5 minutes Blood enters the kidney, then excess sugars, salts, and wastes are removed Purified blood is returned to the circulatory system
Cross-section of a human kidney
Organs: Ureter Water, salts, and other wastes flow from the kidneys to the bladder through the ureters. Ureters
Organs: Bladder Excess waste and water are stored in the bladder About 1 L of urine is produced each day Bladder
Organs: Urethra Water exits the body through a tube called the urethra Urethra
Urinary System: Problems When kidneys don’t filter wastes, the body is slowly poisoned. High levels of glucose (sugar) can signal diabetes. Dialysis: a machine that can do the job of a broken or missing kidney. It will filter the blood.
Dialysis
Kidney Stones
Urinary Tract Infections (UTI)
Urine Color
Blood or food MedicineToo much water Not enough water Medicine or food Healthy! Medicine or food Blood or food
Review Movie
Review Quiz
Name the organs A B C D A-Kidney B-Ureter C-Bladder D-Urethra
What system do kidneys work with? Circulatory System
What is done if kidneys don’t work properly? Blood is filtered in a dialysis machine
Why should women wipe front to back? To avoid getting bacteria in their urethra
What color urine signals that you are healthy? Pale yellow (like hay)
Excretory Lab
Results Sand Water, food coloring, salt
Conclusion 1.Did all the materials pass through the filter paper? Why or why not? 2. What part of the model is like the kidney? 3. What part of the model is like the blood? 4. What materials from this lab would end up in the urine? 5. How is this demonstration similar to the job of the kidneys? 6. What would happen if our kidneys did not function properly and were unable to filter out waste materials?