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 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.

Chapter 6 study Q = pg. 117-120

Crash course excretory