Life Science
Unit Overview:
Chapter 1 – Structure of Living Things
•Lesson 1 – Cells
•Lesson 2 – From Cells to Organisms
•Lesson 3 – Diversity of Organisms
Chapter 2 – Plant Structures and Functions
•Lesson 1 – Vascular Plants
•Lesson 2 – Plant Transport Systems
•Lesson 3 – Photosynthesis and Respiration
Chapter 3 – Human Body Systems
•Lesson 1 – The Human Body
•Lesson 2 – The Digestive System
•Lesson 3 The Respiratory System
•Lesson 4 – The Circulatory System
•Lesson 5 – The Excretory System
The Digestive System
Lesson Overview:
1) What do we already know? (The Human Body)
2) Vocabulary
3) Drawings
4) Main Ideas
5) Review
Human Body Systems: Lesson 2
The Digestive System:
What do we already know?
Page 1
BrainPOP Teaser
1) What would happen to the human body if one
of the organ systems stopped working?
•
•
All other body systems would be affected.
Eventually you would die.
2) What does your circulatory system
transport?
•
•
Oxygen and carbon dioxide
Nutrients from your digestive system.
Human Body Systems: Lesson 2
Page 2
The Digestive System: Vocabulary Part I
1) digestion: the process of breaking down food into smaller,
simpler substances.
2) saliva: a liquid in the mouth that helps soften food.
3) pharynx: part of the throat that connects the mouth to the digestive
tube (esophagus).
4) esophagus: a long muscular tube that leads to the stomach.
Human Body Systems: Lesson 2
Page 3
The Digestive System: Vocabulary Part II
5) stomach: The main digestive organ in most animals.
6) Small intestine: coiled tube/organ that is connected
to the stomach, is where most of your bodies nutrients is
absorbed.
7) Villi: small hair like structures that stick out from the
intestines walls (they help increase absorption of
nutrients).
8) Large intestine: A thick tube/organ that removes
waste from your body (poop).
Human Body Systems: Lesson 2
Page 4
The Digestive System: Drawings (pg. 123)
Human Body Systems: Lesson 2
Page 5
The Digestive System: Drawings (pg. 124)
Human Body Systems: Lesson 2
Page 6
The Digestive System: Drawings (pg. 128)
Human Body Systems: Lesson 2
Page 7
The Digestive System: Main Ideas
1) What is digestion? (pg. 122-123)
a) The breaking down of food into smaller, simpler
substances.
 Quick Check (pg. 123)
-Critical Thinking: Are solids or liquids easier
to digest?
a) Liquids, because they are easier to break down
and absorb.
Human Body Systems: Lesson 2
Page 8
The Digestive System: Main Ideas
2) Where does digestion begin? (pg. 124)
a) The mouth, which includes the teeth, salivary
glands and saliva.
 Quick Check (pg. 125)
-Sequence: What happens after you swallow
a) The food travels down the esophagus, then it
goes into the stomach, where it is digested, then it
travels into the small intestine, where nutrients is
absorbed, then it moves into the large intestine
where it is then stored and eliminated.
Human Body Systems: Lesson 2
Page 9
The Digestive System: Main Ideas
3) How is food broken down further? (pg. 126)
a) Stomach acid digests food into smaller parts.I
 Quick Check (pg. 127)
-Sequence: What happens to the nutrients right before
they leave the small intestine?
a) It is absorbed through the villi into the circulatory
system.
Human Body Systems: Lesson 2
Page 10
The Digestive System: Review
1) Summarize the main ideas
1) Click to Watch!
2) Think, Talk, and Write
Human Body Systems: Lesson 2