Transcript 16 - Nutrition

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