Quiz WHEN?
• Ch 3, 48
48-1:
Nutrients
6 Classes of Nutrients
1.
2.
3.
4.
5.
6.
Carbs
Proteins
Lipids
Vitamins
Minerals
Water
http://www.choosemyplate.gov/
Veggies w/ ALL essential AAs:
What’s this?
• Carb?
• Lipid?
• Protein?
What if you eat too many...
• Carbs?
• Proteins?
• Lipids?
Vitamins & Minerals
• Vitamins are called VITAMINS!!
• Minerals are things off the periodic
table!!
• You NEED BOTH!!! 
– Vit – help enzymes work
• Some toxic– (fat-soluble)
– Min – building body structures,
nerves/muscles, etc
Don’t
want
excess!!
Why do you need water?!?!
•
•
•
•
Solvent!
Transport gases, nutrients, waste
Chemical reactions
Body temperature
p. 984 #1-6, 9
Pineapple Lab!
48-2:
Digestive
System
Let’s Draw!
http://my.hrw.com/sh2/sh07_10/student/flash/visual_concepts/60953.htm
Opener, 9/26
• Start making a list…everything you
ate and drank alllllllllllllllllllllll day
yesterday!
The Digestive Enzymes:
let’s label a diagram!
Site
Enzyme
Role in Digestion
Mouth
Salivary amylase
Breaks down starches into
disaccharides
Stomach
Pepsin
Breaks down proteins into
large peptides
Small intestine
(from pancreas)
Amylase
Continues the breakdown of
starch
Trypsin
Lipase
Continues the breakdown of
protein
Breaks down fat
Maltase, sucrase, lactase
Breaks down remaining
disaccharides into
monosaccharides
Peptidase
Breaks down dipeptides into
amino acids.
Small intestine
Finish the Fast Food Sheet
• So, which has more CALORIES per
gram...
– Carbs
– Proteins
– Lipids
Let’s LABEL...
1. MOUTH:
– Mechanical digestion (chewing)
– Chemical digestion (salivary amylase)
• Starch  maltose
http://my.hrw.com/sh2/sh07_10/student/flash/visual_concepts/60953.htm
2. Esophagus
•bolus (food ball) moves
down by peristalsis
•through cardiac sphincter
to stomach
•NO DIGESTION HERE!
3. STOMACH
•“chyme”
•Protein digestion begins!
•Mechanical Digestion
•muscles churn, physically break
down (3-4 hrs)
•Chemical Digestion
•Inactive secretion of pepsinogen
•@low pH:  pepsin
•Proteins  dipeptides
4. No food thru here...
Liver, Gall Bladder, Pancreas
•Liver:
•Stores glucose (glycogen)
•Makes proteins
•Breaks down toxins
•Makes bile
•Gall bladder:
•Stores bile  released to sm int 
digest fats
•Pancreas:
•Insulin (blood sugar); raises pH of sm int;
•Enzymes for carb, ptn, lipid, nucl acid digestion
5. Sm Intestine
•If stretched out… > 21ft long!!
•3 sections
•Duodenum, Jejunum, Ileum
•Absorption of end products of digestion
•AA, glycerol, fatty acids, monosaccharide
•Absorbed through villi
•Fingerlike projections
•Transferred to circulatory system
6. Lg Intestine (colon)
•Peristalsis moves “leftovers” to lg
int
•Absorb water here, but nutrients
already absorbed
•Away it goes!!
p. 991 #1-5
TEST TOMORROW!!
• REVIEW—
– Quiz from Friday (Chapter 2)
– Homeworks (Ch 2, 3, 48)
Opener Tues 9/29
p.1000
#4,7,8,9,10,11,13,14,15,21