Transcript Small Intestines

09-08- 11
 1) Where does water get absorbed during Agenda
digestion?
1) Warm-Up (5 min)
Large Intestine
2) Homework Due!!
 2) Where are fats broken down during
digestion?
Small intestine
3) Lab Procedures 10 min
4) McMush Lab 45 min
•Just what is in a fast food meal?
•We hear that fast food meals are "bad", but do they
have anything good in them?
•Can they provide some nutrition?
•Are they really high in fat? Well, let's find out!!!
•Carbohydrates, proteins, fats, vitamins, and other nutrients
provide your body with energy and provide the raw materials
necessary to carry on life activities.
•In this lab, you will test for specific compounds and then
determine if these are in a fast food value meal in sufficient
quantities.
Materials:
McDonald's value meal
Benedict's solution- tests for sugar
(carbohydrates)
Biuret solution- tests for protein
Lugol's iodine solution- tests for starch (complex
carbohydrates)
Blender- gotta mix it all together to test it!!
SAFETY NOTE!!! FOR THIS LAB, YOU MUST
WEAR EYE PROTECTION!!!
Based on your knowledge of diet, which biomolecules (lipids,
starches, monosaccharides, and/or protein) do you predict will
be found in a fast food meal?
http://www.youtube.com/watch?v=HwVvloQxeQ&feature=related
Click to hear what
digestion sounds like
in your mouth!
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The mouth is where digestion first begins.
Food starts in your mouth and you begin digestion by
chewing with your teeth.
Food mixes with your salvia to make a soft ball of food.
Next the ball of food moves into the esophagus.
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Food moves through
your esophagus which is
a tube that is about 25
cm long.
It takes 4 to 10 seconds
for your food to move
through the esophagus.
Your smooth muscles
then move the food
down toward the
stomach.
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The stomach is a
muscular bag that can
grow and shrink.
Chemicals are mixed in
with the food in your
stomach in order to
break it down.
Food digests in your
stomach for 2 to 4
hours until it becomes a
liquid called “chyme”
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Your small intestines is 4 to
7 meters in length.
Most digestion takes place
in the small intestines.
Different chemicals are
released into the small
intestines to break down
fats, carbohydrates, and
proteins.
The absorption of nutrients
into your body also takes
place in the small
intestines.
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The liver gives off a greenish fluid called bile which breaks
up the fat in the food you eat.
Fats are broken down in the small intestine.
Your pancreas gives off chemicals that make a digestive
solution which helps break down food in the small
intestines.
It also gives off insulin which lets sugar go into your blood
stream
Liver
Pancreas
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Your large intestine’s main
job is to absorb water
from the mass of food
that has not been
digested.
This keeps water inside
your body so that you do
not dehydrate.
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Your colon is part of your large intestines.
The colon forms waste material that is going to be sent
out of your body.
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The rectum and anus are part of your large intestines.
They release your waste material from the body.
DUE TODAY:
• McMush Lab +Qs
“Either you run the day or the day runs you.”
Jim Rohn
DUE NEXT CLASS:
• BRING BIO. BOOK