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Unit 19: Biology Part 2 Page 21 of 137
Objectives
Lesson 2: Digestive System
What should we eat? What A healthy diet is a balanced diet. A
happens to food once we swallow diet that includes the right
it? How long is our digestive amounts of protein, grains, fruits,
system? You’ll learn all about food, vegetables, and dairy.
nutrients, how your digestive
system works, and why the We will also learn how to check the
standard American diet of fries, nutrition facts found on the labels
shakes, and sodas wreaks havoc of packaged food and drink. They
on our digestive system. will tell you the information you
need to know to make smart food
Food and Nutrients decisions!
We need to eat and drink to have Exercise is just as important as a
energy, build and repair our good diet—we need both. A good
bodies, and maintain homeostasis. goal is 60 minutes of exercise 3
times a week.
The six things we need to consume
are protein (things like fish and The Digestive System
certain vegetables), carbohydrates
(things like bread), lipids (fat), Digestion is broken down into four
vitamins (found in high steps: mechanical digestion (with
concentrations in fruits and our teeth), chemical digestion
vegetables), minerals (certain (with our enzymes), absorption
molecules our systems need), and (when we take the nutrients into
water. our body), elimination (when we
get rid of the waste).
Creating a Healthy Diet
Enzymes are chemicals in our body
The new, simpler “My Plate” which make chemical reactions go
division of dietary faster; they are catalysts.
recommendations from the USDA
has replaced the old “My Pyramid”. The digestive organ—from mouth
to anus—is enormous. On average,
it’s over thirty feet long!
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