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Digestive System
Catalyst Sarah is concerned because she is getting sick all the time. What body system may not be working properly?
Describe gas exchange. (What is it? Where does it occur?)
Explain how the respiratory system maintains homeostasis.
Work on the Warm-Up Activity at the top of your worksheet.
Agenda
Catalyst review Warm-up activity Predictions! The Digestive System! NOM NOM NOM! Flow of Food Exit Question
HW: Patient Diagnosis – GERD (AKA Acid Reflux)
What’s in the digestive system?
Stomach Large Intestine
Teeth Liver
Small intestine
Mouth Anus Esophagus
Is there a “rule” for organs in the digestive system?
Get Out Your Notes
Expectations: You will be looking at the picture on the board and writing. ONLY WRITING.
This is a silent activity.
1. Why do you think the digestive system is shaped like this?
2. Predict the function of each part.
3. Describe how this system maintains homeostasis.
4 Minutes to write. It is OK if you are wrong, just THINK!
What’s the point?
Key Point #1: The digestive system breaks down food into carbohydrates, protein, and fats.
The body uses these three molecules for different functions.Carbohydrates = quick energyProtein = build muscleFat = long term energy storage
One long tube…
Key Point #2: The digestive system is one long tube that changes structure along the way.
Each part has a specific purpose in digesting food…
What’s the first stop?
In yo’ mouth!
Teeth crush food into smaller pieces
Saliva begins to digest carbohydrates into sugars
Swallowing causes a flap of skin – epiglottis – to cover your trachea (windpipe) so food goes down right “pipe”.
Next Step
Have you ever tried to swallow food upside down? Why is it possible?
Esophagus: tube that connects mouth and stomach
Peristalsis is the contraction of muscle as the food moves down
Digestion All-Star
Small Intestine:Finishes digesting and ABSORBS nutrients
Very long (16-20 ft!)
Almost all nutrients are absorbed into the blood through the walls of the small intestine WHY?? What does the blood do?
Helpers: Liver & Pancreas The liver aids in digestion by producing bile Bile helps to break down fat
The pancreas aids in digestion by producing many different enzymes to break down food.
Practice – Graphic Organizer!DIRECTIONSWithout using your notes…
Left side: Describe what the part does
Right side: Predict what would happen if that part of the digestive system was not working
EXPECTATIONS Be creative! THINK! Whispers only. Stay in your seat.
Key Point Wrap-Up
Key Point #1: The digestive system breaks down food into carbohydrates, protein, and fats.
Key Point #2: The digestive system is one long tube that changes structure along the way.