2. Human Organization Cells- smallest living unit
Tissues- group of similar cells
Organs- group of tissues doing a job
Systems- groups of related organs working together ex...

3. We will study these Human Systems
Has blood, blood vessels, and a heart?
Circulatory System
Bony support system?
Skeletal System

4. Human Systems Muscular System Produces new humans using sperm and egg?
Moves the bones?
Muscular System
Produces new humans using sperm and egg?
Reproductive System

5. Human Systems Nervous System Controls body by chemicals?
Controls body by electricity?
Nervous System
Controls body by chemicals?
Endocrine System

6. Human Systems Provides oxygen to our cells? Respiratory System
Removes wastes?
Excretory System

7. ... and our 1st system???
Digestive
System
Stop at intestine section

8. Digestion- process of breaking food down into usable molecules.
Physical- large to small pieces using teeth and tongue

9. Digestion- breaking down food
Chemical-breaking small pieces into molecules using chemicals called enzymes

10. Types of Foods
Carbohydrates- 70% of diet. Starches and sugars are digested to glucose. Used for energy.
Protein- 20% of diet. Digested to amino acids which are used to build human protein.

11. *Most meals have all three types of foods in them.
Types of Foods(cont.)
Fats- 10% of diet. Digested into fatty acids which are needed in small amounts for healthy cells.
*Most meals have all three types of foods in them.

12. Hey buddy, how about a peanut butter sandwich? I dare Come on you!
dude,
do it!

13. The Evolution of a Peanut Butter Sandwich or...
Parts and functions of the Human Digestive System!

14. Digestive Organs Teeth- physical digestion
Saliva glands- enzymes for carbohydrates. Moistens food
Tongue - swallows food to back of throat

15. Esophagus- moves food to stomach by wavy, muscular contractions called peristalsis
Stomach- storage sac and a site of physical (muscles) and chemical (acid + enzymes) digestion

16. The Stomach?
Not!!!

17. This is the stomach!
A J-shaped organ about the size of two fists. It’s located under your left rib cage

18. Jobs of the Stomach
Stores food so that only small amounts pass to the small intestine at one time.
Starts Digestion:
Physical- muscles
Chemical- acid and enzymes

19. Inside the Stomach
Acid/Enzyme
glands
Muscle
Walls
Sphincter
Muscles

20. Stomach Problems!

21. Minor Stomach Problems
Acid indigestion-too much acid secreted.
Nausea- stomach may choose to reverse peristalsis
Stomach cramps-FALSE usually gas in intestines

22. Major Stomach Problems
Ulcers- acid burns a hole in stomach muscle
Stomach cancer- cancer cells grow and take over the stomach. Can remove stomach
Gastroesophageal Reflux- What do you think that is???

23. Small intestine - most important organ in digestive system
1st 12 inches finishes digestion using enzymes from liver, gall bladder, and pancreas
Last 19 feet is used to absorb digested food molecules into the bloodstream

24. The first 12 inches gets enzymes from the:
Liver- produces bile for digesting fats (+ lots more!!!)
Gall bladder- stores bile and delivers it to the small intestine
Bile duct- carries bile to small intestine

25. Liver
Gall
Bladder

26. Pancreas- makes a special enzyme for each food type: Carbohydrates, Fats, and Protein p.s. Also makes
insulin for
absorbing
glucose into
cells.

27. The Liver, Gall Bladder and Pancreas all empty their enzymes into the first 12 inches of the small intestine(the duodenum). The small intestine is the most powerful chemical digestion organ!!

28. The job of the last 19 feet is absorption of digested food molecules.
Appendix Video

29. Absorption-movement of molecules by “diffusion” through the small and large intestine to the bloodstream.

30. Not only is the small intestine 20 feet long, but the inside surface is filled with villi which increase the absorption area of small intestine.

31. Nutrients Absorbed
Calories of energy- mostly from carbohydrates (glucose)
Body builders- mainly from proteins (amino acids)

32. Nutrients Absorbed Regulators- tune up the body (“oils your body”)
fatty acids from fats
vitamins and minerals
water

33. ... plus anything else that is small enough to pass through the small intestine.

34. Large
Intestine
Rectum
Anus

35. Large Intestine (colon)- reabsorbs water and enzymes into bloodstream
H2O and Enzymes
Large Intestine (colon)- reabsorbs water and enzymes into bloodstream
Wastes

36. The Digestive System Eating, Digesting, Absorbing,
Pooping all make us healthy and happy!