the excretory system. write the black read the red
TRANSCRIPT
• 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.
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
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)
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
DIGESTIVE RESPIRATORY CIRCULATORY EXCRETORYfood--> nutrients oxygen (O2) in blood transports skin- heat out
broken down by: nutrients and O2 & sweat out
carbon dioxide to cells
mechanical- chew, (CO2) out kidney- urea,
churn, peristalsis transports waste water, sugar
and CO2 from salts out
chemical- acids, 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 kidney- blood
be taken to cells for E 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.