1. The Human Digestive System
Pre-Lesson Inquiry: What do you already know?
Complete the Digestive System Handout to the best of your ability without looking in any text or your notes
You may work in groups
Do not complete the bottom overview

2. The Human Digestive System
Pre-lesson Inquiry
Why do we have a digestive system?
Main Components
Digestive Enzymes
Chemical and Mechanical Digestion
Digestion Activity 1 and 2
Digestive Organs
Accessory Organs
Interactive Activity

3. TeachWithFergy Preview File
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4. Watch The Following Videos To Get You Started
Click on the video icons in SLIDESHOW mode to see how videos are embedded into your lesson
How much can you eat?
Mr. Eats All

5. Why do we need a Digestive System?
When you eat foods such as bread, meat, and vegetables, they are not in a form that the body can use
Food and drink consumed must be broken down into smaller ___________

6. Components of the Digestive System?
The Digestive Tract is a series of hollow organs joined in a long, twisted tube from the mouth to the anus
Organs involved:
Mouth
Esophagus
Stomach
Liver
__________
Oral Cavity (mouth)
Esophagus
Small Intestine

7. Components of the Digestive System?
The entire length of the digestive tract is lined with __________
Contains lots of _______________which secrete mucus. The mucus does two things
______________
Moves materials along the tube

8. Digestive Enzymes Digestive Enzymes ……………….
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9. The Mouth Mechanical Digestion Chemical Digestion
Digestion begins in the oral cavity (mouth) where 2 types of digestion take place:
Mechanical Digestion
Chemical Digestion

10. Mechanical Digestion
Chewing breaks up large pieces of food into smaller ones

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12. Chemical Digestion
Saliva also contains mucus and water which makes food easier to swallow

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14. Chewing Crackers Part 2 – Record your observations
Place a cracker in your mouth and let it sit for 1.5 minutes before chewing
What does it feel like initially in your mouth? Is it sweet, bland, etc.?
What does it feel like after 1 minute?
What does it feel like after 1.5 minutes?
What does it feel like when you chew it?

15. Chewing Crackers Discussion
What was the main texture (feeling) difference in your mouth between chewing right away and waiting 1.5 minutes before chowing down?
When the cracker is in your mouth your saliva starts to break it down  get’s softer

16. Grab a ruler and have a look
Esophagus
Food enters the esophagus which is a narrow, muscular tube about ___________
………………..
Grab a ruler and have a look

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18. Esophagus
The wall of the esophagus is made up of two layers of __________
If a person were to swallow while being upside down you could see the muscles in action

19. Demonstration Gently place your hand over your throat and swallow
What do you feel?
2) Turn to someone next to you
Have your partner tilt their head up
Watch their neck as they swallow – reverse roles

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21. Stomach
____________
Stomach cells produce acid (HCl) which helps break down proteins
The stomach cells also secrete mucus to protect its lining from the acid
Sometimes …………..

22. Stomach
Mechanical Digestion: The muscles of the stomach wall contract and expand to _________
The growling sound you sometimes here is your stomach moving
This is smooth muscle

23. Bread in bag experiment:
Take 1 piece of bread per two students. Rip in half so each student has ½ of a slice
Obtain a small sandwich bag from the front of the room
Tear your ½ slice of bread into smaller pieces and place it into your sandwich bag (What does this represent?)
Your teacher will come around now and pour a small amount of juice into the bag
Close your bag and squish the bread with your fingers until all of the pieces are really small (What does this represent?)
Put all of the contents of the bag into the garbage (What does this represent?)

24. Small Intestine
The small intestine further splits food into smaller pieces. __________
Blood

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26. Large Intestine Sometimes called the Colon Its function is to _______
Also stores the remains of the food that cannot be absorbed (wastes) before they are flushed from the body
About 1.5 ……………..
Called the large intestine because it has a much larger diameter than the small intestine

27. Rectum
The rectum ____________________________ __________________________ before it is excreted from the body
Uranus

28. Accessory Organs
The Liver, Pancreas, and Gall Bladder all help with the digestion by _________
The Liver also produces__________
These substances are delivered into the ___________

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30. Pancreas
Is involved in supplying enzymes required for digestion directly into the small intestine
Secretes a hormone called insulin directly into the blood stream
Insulin causes most of the body's cells to _________
_________

31. Review and Revisit Name that Digestive System Organ 1) _________
2) _________
3) _________
4) _________
5) _________
6) _________
7) _________ 1 2 3 4 5 6 7

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Excellent Digestive System Interactive Activity In slideshow mode, please Click to visit
The link to this animation has been removed.