1. Science Starter: Classwork 22– 5CDE
Monday April 10, 2017
Learning Target: Distinguish between physical and chemical changes in the digestive system
Science Starter:
Classwork 22– 5CDE
Supplies:
Digestive System Workbook
Classwork #22
Knowledge Check
Notecard

2. Daily Agenda Worth the Wait forms due Friday April 28 Heartbeat
Reminder Test Tuesday April 18 over
ALL BODY SYSTEMS
Digestive SONG!!!
Digestive System Notes
Physical and Chemical Changes

3. Organs of the Digestive Tract
Mouth = digestion starts here

4. Organs of the Digestive Tract
Mouth = digestion starts here
Tongue & teeth mechanically break food up

5. Organs of the Digestive Tract
Mouth = digestion starts here
Tongue & teeth mechanically break food up
Saliva chemically digests food
Saliva = mostly made of
water, also contains
mucus & ptyalin (an
enzyme)

6. Organs of the Digestive Tract
Mouth = digestion starts here
Tongue & teeth mechanically break food up
Saliva chemically digests food
Saliva = mostly made of
water, also contains
mucus & ptyalin (an
enzyme)
When swallowing, epiglottis
(a small flap of tissue) automatically closes over the trachea (windpipe)

7. Organs of the Digestive Tract
Esophagus
Smooth muscles force food into the mucus-lined esophagus
Rhythmic muscular
contractions
(peristalsis) push food
downward

8. Organs of the Digestive Tract
Stomach
Food undergoes mechanical digestion when stomach muscles churn the food
Chemical digestion
happens when hydrochloric
acid (HCl) and pepsin
break down the complex
proteins
Peristalsis pushes the food
toward stomach’s exit

9. Which is not an example of mechanical digestion?
Teeth chewing food
Tongue breaking up food
Smooth muscles in stomach churning food
Pepsin & HCl breaking down proteins

10. What are the muscle contractions that push food through the digestive system called?
Elimination
Peristalsis
Epiglottis
Pepsin

11. What is this structure?
Mouth
Epiglottis
Esophagus
Stomach

12. Organs of the Digestive Tract
Small Intestine (6 meters long)
Most digestion happens here
Intestinal juice
(full of enzymes)
breaks down food

13. Organs of the Digestive Tract
Small Intestine (6 meters long)
Most digestion happens here
Intestinal juice (full of enzymes) breaks down food
Digestive Helpers
Liver = bile is
produced here (Bile
breaks up fats like
dish detergent
breaks up grease)

14. Organs of the Digestive Tract
Small Intestine (6 meters long)
Most digestion happens here
Intestinal juice (full of enzymes) breaks down food
Digestive Helpers
Liver = bile is produced
here (Bile breaks up fats
like dish detergent breaks
up grease)
Gall bladder = bile
is stored here until
released into the small intestine

15. Organs of the Digestive Tract
Small Intestine (6 meters long)
Most digestion happens here
Intestinal juice (full of enzymes) breaks down food
Digestive Helpers
Liver = bile is produced
here (Bile breaks up fats
like dish detergent breaks
up grease)
Gall bladder = bile is
stored here until released
into the small intestine
Pancreas = produces
pancreatic juices that
are released into the small intestine to break down proteins,starches, & fats

16. Organs of the Digestive Tract
Small Intestine (6 meters long)
Most digestion happens here
Intestinal juice (full of
enzymes) breaks down food
Digestive Helpers
Liver
Gall bladder
Pancreas
Digested food is
absorbed through the villi into a network of blood vessels that carry the nutrients to all parts of the body

17. Organs of the Digestive Tract
Small Intestine (6 meters long)
Most digestion happens here
Intestinal juice (full of enzymes)
breaks down food
Digestive Helpers
Liver, Gall bladder, Pancreas
Digested food is absorbed
through the villi into a network of
blood vessels that carry the
nutrients to all parts of the body
e) By the time food leaves the small intestine, it is empty of all nutrients except water

18. Where does most digestion take place?
Mouth
Stomach
Small intestine
Liver

19. Which is true about bile?
Bile breaks down proteins.
Bile is produced in the liver.
Bile is stored in the pancreas.
Bile is released into the stomach.

20. What is this structure?
Liver
Stomach
Gall bladder
Pancreas

21. Organs of the Digestive Tract
Large Intestine (1.5 meters long)
Undigested food spends hours here & most of the water is absorbed

22. Organs of the Digestive Tract
Large Intestine (1.5 meters long)
Undigested food spends hours here & most of the water is absorbed
Helpful bacteria
living in large
intestine make
vitamins K & B

23. Organs of the Digestive Tract
Large Intestine (1.5 meters long)
Undigested food spends hours here & most of the water is absorbed
Helpful bacteria living in
large intestine make vitamins
K & B
Materials not
absorbed form into
solid waste (dead
bacteria, some fat &
protein, undigested
food, dried out parts of
digestive juices & old intestinal cells)

24. Organs of the Digestive Tract
Large Intestine (1.5 meters long)
Undigested food spends hours here & most of the water is absorbed
Helpful bacteria living in large
intestine make vitamins K & B
Materials not absorbed form into
solid waste (dead bacteria,
some fat & protein, undigested
food, dried out parts of digestive
juices & old intestinal cells)
Solid waste passes
into the rectum and is stored until it is eliminated from the body through the anus

25. Which process occurs in the large intestine?
Digested food is absorbed.
Undigested food is absorbed.
Water is added to undigested food.
Water is absorbed from undigested food. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

26. Which structure is the large intestine?B C D A B C D 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

27. What do the bacteria in the large intestine do?
Make you sick
Make bile
Make vitamins
Make food 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

28. Knowledge Check

29. Physical Vs Chemical Changes
On a notecard:
Write numbers 1-10
Gallery Walk with the notecard
Write Physical or Chemical next to the number on the notecard.
You may use your notes and get a clipboard if you need it!
Please work independently!!!

30. Closing/Exit Ticket