Download 33 Digestion - mrhortonbiology

Bellwork 10/18 Tuesday
What do you think is the total time food spends in
your body, from the first bite until it goes out
the other end. How long do you think it
spends in each part of the digestive system?
Agenda:
1. Finish digestion notes
2. Review digestion notes
3. Sugar activity
4. Nutrition Label discussion
5. Nutrition label practice
Objectives
• Students will be able to identify the parts
of the digestive system and explain their
functions
• Students will be able to determine
percentage of calories from fat and sugar
using nutrition labels
Digestion!
Make your own notes!! (p. 946 – 953)
*Write out the following questions and blanks in complete sentences in your
own words:
1.
Digestion is the body’s way of:
2.
The first step in the digestive system is:
3.
One digestive enzyme in saliva is_____ which is responsible for:
4.
You can swallow food upside down because:
5.
What happens in your stomach is:
6.
Stomach acid doesn’t digest the stomach because:
7.
In the small intestine, strong acids from the stomach get neturalized by:
8.
Nutrients get into your bloodstream through_____ which are:
9.
After the small intestine, food passes into the ______ which is
responsible for:
10. The job of the pancreas is:
11. It’s a good thing we have a liver, because the liver:
12. Draw all the parts of the digestive system and label them (p. 947)
•
BONUS: what is the greek meaning of the word “peristalsis” (Hint: it’s in
your textbook)
Question 1) Digestion is the body’s way of:
• Breaking down food for
energy
•
Provides building blocks
macromolecules:
Question 2) The first step in the digestive system is:
• Mouth
Question 3) One digestive enzyme in saliva is_____
which is responsible for:
– Amylase 
– An enzyme that breaks down starch into
sugar
Question 4) You can swallow food upside
down because:
•
Peristalsis pushes the food down the
esophagus
Question 5) What happens in your stomach is:
– Physical digestion: muscles squeeze the food
– Chemical digestion: acids dissolve the food
Question 6) Stomach acid doesn’t digest the
stomach because:
- The stomach secretes mucus to protect
itself from the strong acid
Question 7) In the small intestine, strong
acids from the stomach get neutralized
by:
- juices from the pancreas
Question 8) Nutrients get into your bloodstream
through_____ which are:
• Villi (singular is villus)
– Lots of tiny folds that increase surface area
Question 9) After the small intestine, food
passes into the ______ which is
responsible for:
• Large Intestine (colon)
– Absorbs water (so you don’t dehydrate)
Question 10) The job of the pancreas is:
– Secrete digestive enzymes and hormones to
break down carbs, fats, and proteins
– Makes strong base
Question 11) It’s a good thing we have a
liver, because the liver:
– Makes bile, which breaks down fats
– Also does lots of other stuff!
Question 12)
Mouth
Salivary Gland
Esophagus
Gallbladder
Small Intestine
Pancreas
Very very bad joke
Which digestive organ gets the highest
grades on tests?
The large intestine
How much sugar is actually in this
stuff?
Beverage
Volume
Sample Letter
Mass of sugar (grams)
1. Soda
12oz
C
40g
2. Apple Juice
8oz
D
24g
3. Gatorade
20oz
B
34g
4. Monster
24oz
A
81g
Nutrition Labels
Sugar Calories = grams sugar x 4 cals/g
= 16 x 4
= 64 sugar calories
% Sugar = (sugar calories / total calories) x100
= 64 / 212
= 0.30
= 30%
Fat Calories = grams fat x 9 cals/g
=7x9
= 63 fat calories
% Fat = (fat calories / total calories) *100
= 63 / 212
= 0.29
= 29%
*wait, but it says 11% fat!?!?!?
Sneaky
Write this in your notes
1. Name of food:
Sugar Calories = grams sugar x 4 cals/g
= _____ sugar calories
% Sugar = (sugar calories / total calories) x100
= ____ %
Fat Calories = grams fat x 9 cals/g
= _____ fat calories
% Fat = (sugar calories / total calories) *100
= ______ %
Glucose
Used for
Quick Energy
Fatty Acids & Glycerol
Amino Acids
Building block
for starches
Building Blocks
of Proteins
Used for
Energy
Building blocks
For Fats
– Has lots of Probiotics (friendly bacteria)
• Keep disease bacteria from multiplying
• Make Vitamin K (needed for blood clotting)
• Eat remaining nutrients that you can’t digest
– When bacteria have a lot to eat, they make a lot of gas
– About half of feces is bacteria