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The Excretory System • Write the BLACK • Read the RED WHAT DO YOU KNOW ABOUT THE EXCRETORY SYSTEM? Follow along on pg. 115 of the workbook Excretion • Waste products (toxic) eliminated from body • Blood balance in our bodies is maintained by : the kidneys, lungs and sweat glands Structure Excreted product Lungs Carbon dioxide (CO2) Sweat glands Sweat (water, heat) kidneys Urine (water, salts) Sweat glands in the skin • Glands under surface = excrete sweat up to skin’s surface • Helps regulate body temperature (liquid absorbs heat from body to evapourate- change of state) • Sweat = water & waste materials from blood Antiperspirant or D.O? • Antiperspirants = fragrance and chemical compounds that block the pores to stop perspiration. No sweat, no odour. • Deodorant = allow release of perspiration, antiseptic agents kill odour-causing bacteria. Use pg. 191-192 of textbook to help fill in pg. 115 of workbook Check your answers Structures of the Urinary System Function Kidneys Homeostasis via production of urine Ureter urine from kidneys bladder Bladder Stores urine until released- can hold 1 L Urethra urine = bladder outside Lab 60 dissect a kidney (if we can get them) Components of Urine (a solution) • 95% of urine is water • 5% is solutes (chemicals dissolved in water e.g. urea, uric acid, salts, etc.) • If protein, blood, glucose, fats= problem • Traces of medication or drugs (see next slide) How long do drugs stay in your urine? • Alcohol 3 - 5 days • Amphetamines (speed) 1 - 3 days • Barbiturates (downers) 2 - 4 days • Cannabis (weed) 7 to 30 days • Cocaine 3 - 4 days • LSD (acid) 1 - 3 days • MDMA (ecstasy) 3 - 4 days • Methamphetamine (crystal meth) 3 - 6 days • Rohypnol (date rape drug) 2 days (maximum) Urine should be: • Clear dark amber (varies with hydration) • Unusual colours can indicate different problems. • Usually odourless (except after certain foods e.g. asparagus) • Clear. Turbid (cloudy) urine =infections or crystals • Neutral. A pH of around 7. • 1-2 L a day Did you Know? • Urine has been used to tan leather, cure bee stings, jellyfish stings, and athlete’s foot • In the case of emergency, drinking urine can buy the body a few days before death (you will die faster without liquids than without food) patches Pre-lab notes: Indicators • Used to test the presence of certain substances • E.g. litmus paper = if liquid is acidic (pink), basic (blue) or neutral (no change). • qualitative property- using your senses to observe, not measured e.g. colour • quantitative property- using lab procedures to measure e.g. density Homework pg. 116 of workbook Discussion Pg. 197 of textbook Q 18-20 DIGESTIVE RESPIRATORY CIRCULATORY EXCRETORY oxygen (O 2 ) in food--> nutrients blood transports skin- heat out broken down by: nutrients and O2 & sweat out carbon dioxide to cells mechanical- chew, (CO2) out churn, peristalsis kidney- urea, transports waste water, sugar and CO2 from chemical- acids, salts out cells enzymes, pepsin nutrients O2 taken by all through skin- vasodilate absorbed in blood to cells organs and blood to skin small intestine as needed to body cells go into blood to burn nutrients be taken to cells for E kidney- blood it is the filtered in transportation nephron CO2 produced bysystem cells taken to lungs by blood Build a Concept Map • Read page 112 in your Toolbox on how to create a Concept Map • Using the ALL the words on page 197 to create a BIG concept map for Chapter 6 of your textbook. • You can use your notes too. Chapter 6 study Q = pg. 117-120 Crash course excretory