1. BODY SYSTEMS!
7-10 min review of answers
Ask Students Questions

2. This unit is about different BODY SYSTEMS….

3. maintaining homeostasis in the human body!
homeostasis: a stable, internal environment body

4. Examples of homeostasis…
Good blood sugar
Good body fluid level
Ability to reproduce
Reacting to a hot stove
Sweating to maintain temp.
Urinating to maintain pH

5. What does our Digestive System do?
Key Point #1: The digestive system has 3 very important jobs:
Converts food into simple molecules that can be used by the body
Absorbs food/nutrients
Eliminates waste

6. Digestion
Key Point #2: Digestion is the process of breaking down food.
Mechanical digestion = the physical process of breaking down food into smaller pieces
Teeth crushing the food in the mouth.
Chemical digestion = the process of changing food into tiny molecules that your body can absorb more easily
Pepsin, an enzyme in your stomach, breaks the food particles into cell-friendly pieces.

7. No Need to memorize all of these…I will tell you which ones you should be familiar with!
Just for them to see what is involved in the digestive system.

8. The Parts
Key Point #3: There are different organs in your digestive system, and each plays a part in the process so that nutrients reach your body cells.
MouthPharynx EsophagusStomachSmall intestineLarge intestine
NOTE: There are other structures that we will see shortly.

9. ORGAN SPOTLIGHT! MOUTH Chemical and Mechanical Digestion
Saliva = chemical
Mechanical=chewing

10. ORGAN SPOTLIGHT! Pharynx
Pharynx means throat
Food passes through the mouth to the esophagus

11. ORGAN SPOTLIGHT! Esophagus
How food travels from the throat to the stomach
Muscles in your esophagus move the food without you even thinking about it

12. ORGAN SPOTLIGHT! Stomach
Acids in your stomach break down your food into a consistency like a smoothie 
It takes 4 hours for food to exit your stomach

13. Acid Reflux– Heartburn Gastric Juice creeps up the esophagus because of faulty sphincter
Background Info

14. Esophagus Cardiac Sphincter Pyloric Sphincter Stomach Duodenum
Background Info
Duodenum

15. ORGAN SPOTLIGHT!
All of the nutrients from your food are absorbed when it is in your small intestine
All the good stuff from your food goes

16. ORGAN SPOTLIGHT! Water is absorbed from the remaining food.
The food is turned into waste products and prepares to exit the body

17. Why is the digestive system important?
Key Point #4: If the digestive system malfunctions and food is not digested properly, the body will not receive the right energy and nutrients it needs to function.
The things that need to happen in order to promote homeostasis (stable internal environment)
Eating a balanced meal
Digestive organs need to function properly
Nutrients need to be absorbed & distributed
Waste exits body on a normal basis

18. Handout the “Student Made Notes”

19. Guided Practice
This is where water is absorbed from food

20. Muscle contractions help move food down this tube

21. The site of chemical digestion by saliva

22. This turns food into a smoothie like consistency

23. Where the nutrients from your food are actually absorbed so they can be used

24. The site of mechanical digestion by teeth

25. The passageway from the mouth to the esophagus

26. Crone’s Disease: 2 cards
(no nutrients or water get absorbed from your food)

27. The last organ food passes through before it is released as waste through the rectum

28. A very acidic organ

29. Acid Reflux (2 organs)

30. The tube that connects the mouth to the stomach

31. Where food goes after the stomach

32. Constipation & diarrhea are both because of a malfunctioning…

33. Another word for throat