NUTRITION AND
DIGESTION
LIFE PROCESSES
Nutrition
Lesson 1
Do Now

Food Labels Worksheet
Why do you need to eat?
 How can a food label show what you are eating and
how much?

Nutrition?


Process of taking in
nutrients (eating)
Used in:
Cell respiration (ATP)
 Metabolism
 Growth
 Repair

2 Types of Nutrition

Autotrophic: organisms that make
their own food through
photosynthesis


Ex: ________________________
Heterotrophic: organisms that take
in food

Ex: ________________________
Digestion

Breaking nutrients into smaller molecules that
can enter cells through the semi-permeable
membrane

Starch breaks down into ________________
Protein breaks down into ________________
Lipids break down into__________________


Unicellular Organisms

Take in food through phagocytosis by
englufing and surrounding a substance

Ex: ______________________________
Human Digestion

Purpose: to get nutrients from food into cells

1 way passage: in the mouth and out the anus

Food enters through the mouth and moves slowly
through the system by muscular contractions called
peristalsis

Food never enters tissue
Basics
1.
2.
3.
Food is broken down by mechanical
digestion (chewing) and chemical digestion
(enzymes)
Molecules are absorbed
Undigested food is eliminated as solid waste
In class assignment

Mini-lab demonstration: mechanical digestion
vs. chemical digestion
Homework

Nutrition Sources and Facts Worksheet
Human Digestion
Lesson 2
Do Now


Are Viruses Alive worksheet
Using what you already know about your body
and the digestion system label the diagram as
best you can.
Pathway of Digestion



Food enters through the
mouth (ingestion)
Teeth break down food
into smaller pieces by
mechanical digestion to
increase surface area
Saliva is secreted to
chemically break down
food (enzymes: amylase
and lysozyme)


Food is swallowed and pushed into the
esophagus by peristalisis
Food is pushed into the stomach
Large muscular organ
 Contains HCl (pH 2)
 One way valves

In class assignment

Mini-lab demonstration: how peristaltic action
works “I Feel Squeezy”

Food is pushed into the small intestine (7
meters) by peristalsis
Site of most chemical digestion by enzymes
 Villi increase surface area to absorb nutrients into
the bloodstream
 Blood brings the nutrients to cells


Waste is pushed into the large intestine (shorter
and wider than the small intestine)

Main site of water absorption
Too much water absorbed = constipation (doesn’t get rid of
enough water)
 Too little water absorbed = diarrhea (gets rid of too much
water)


Stores solid waste until it is eliminated through the anus
Accessory Organs



Liver: emulsifies (breaks down) fats by
producing bile
Gallbladder: stores bile
Pancreas: releases insulin to decrease blood
sugar
Food
Where
digestion
begins
Where
digestion
ends
End product
Starches/
Carbs
Mouth
Small
intestine
Simple
sugars
Proteins
Stomach
Small
intestine
Amino acids
Fats
Small
intestine
Small
intestine
Fatty acids
and glycerol
Disorders





Appendicitis
Gallstones
Ulcer
Colon cancer
Cirrhosis
Homework

Digestion Worksheet
Out to Lunch
Lesson 3
Do Now

Nutrient Uptake worksheet
In class assignment

Watch the video: Magic School Bus “Out to
Lunch” http://www.gamequarium.org/cgibin/search/linfo.cgi?id=3420
Homework

Chapter 22 Study Guide worksheet
Digestion Construction
Lesson 4
Do Now

Label and Describe the Digestive System
Worksheet
In class assignment


Work with a lab partner to construct the entire
digestion system using the materials provided
Models should be 3-D and accurate
Homework

Practice Regents Digestion questions
Digestive System Lab
Lesson 5
In class assignment/homework

Digestive System lab
Virtual Body
Lesson 6 (optional)
In class assignment

Watch a computer simulation of the digestive
system and complete the worksheet