2.  What is Digestive System?
 Stages of digestion
 Parts of Digestive System.
-mouth.
-pharynx etc..
 A problem of the Digestive System
-Constipation.
 The Lab
 Data

3.  The process of breaking down materials (food)
into chemicals that give nutrients for the body.
 Stages of Digestion :
1- Ingestion.
2-Digestion.
3-Absorption.
4-Elimination.
Source (1,2,7)

4.  Mouth (Oral Cavity) : First part to begin
the process digestion by chewing the food.
 Pharynx : Receive the food from the
mouth and carries the food to the stomach.
 Stomach : breakdown the food.
 Small Intestine : 22-feet muscular tube
contains enzymes to breakdown food.
 Large Intestine : Responsible for processing
waste product.
 Anus : is the opening where the
gastrointestinal tract ends and exits the body.
Sources (3,4,5)

6.  “Constipation is a condition in
which a person has fewer than
three bowel movements a week
or has bowel movements with
stools that are hard, dry, and
small, making them painful or
difficult to pass.”
 How common is it?
It is one of the common GL diseases in the USA
 Affects 42 million or 15% of the population.
Source (6,7,8)

7.  What causes it?
-Stool spends a lot of time in the colons.
-Diets low in fiber.
-Lack in Physical activity.
-Life routine changes.
How is Science applied?
-Surgery.
-exercise.
Source (6,7,8,9,10)

8.  The problem : How does the temperature of hydrogen peroxide
effect the gas pressure when combined with catalase enzyme?
 Hypothesis : Higher pressure generally causes more collisions
among the molecules and therefore increases the rate of a reaction.
 Materials :
-0.5 g of catalase.
-10 ml of Hydrogen Peroxide.
-150 ml beaker.
- Test tube.
-Balance (g).
-heater.
-thermometer (Kps)
 Procedure

10.  1- "Human Digestive System." Wikipedia. Wikimedia Foundation, 25 May 2014. Web. 25
May 2014. <http://en.wikipedia.org/wiki/Human_digestive_system>.
 2- "Overview of the Digestive Process." Digestive Processes. N.p., n.d. Web. 25 May 2014.
<http://www.ivy-rose.co.uk/HumanBody/Digestion/DigestiveSystem-
BasicStages.php>.
 3-"Overview of the Digestive Process." Digestive Processes. N.p., n.d. Web. 25 May 2014.
<http://www.ivy-rose.co.uk/HumanBody/Digestion/DigestiveSystem-
BasicStages.php>.
 4-"The Digestive System Diagram, Organs, Function, and More." WebMD. WebMD, n.d.
Web. 25 May 2014. <http://www.webmd.com/digestive-disorders/digestive-system>.
 5-"Cleveland Clinic - The Structure and Function of the Digestive System." Cleveland
Clinic. N.p., n.d. Web. 23 May 2014.
<http://my.clevelandclinic.org/anatomy/digestive_system/hic_the_structure_and_fun
ction_of_the_digestive_system.aspx>.
 6- "National Digestive Diseases Information Clearinghouse (NDDIC)." Constipation. N.p.,
n.d. Web. 25 May 2014.
<http://digestive.niddk.nih.gov/ddiseases/pubs/constipation/>.
 7-"Digestion." Wikipedia. Wikimedia Foundation, 25 May 2014. Web. 25 May 2014.
<http://en.wikipedia.org/wiki/Digestion>.

11.  8-"Enema." Wikipedia. Wikimedia Foundation, 25 May 2014. Web. 26 May 2014.
<http://en.wikipedia.org/wiki/Enema>.
 9-"Constipation: Treatment and Severe Constipation Remedies." MedicineNet. N.p.,
n.d. Web. 26 May 2014.
<http://www.medicinenet.com/constipation/article.htm>.
 10-"Treatment for Constipation: Laxatives, Diet Changes, & More." WebMD.
WebMD, n.d. Web. 26 May 2014. <http://www.webmd.com/digestive-
disorders/understanding-constipation-treatment>.
 11-"Home Remedies for Constipation for Ages 12 and Older." WebMD. WebMD,
n.d. Web. 26 May 2014. <http://www.webmd.com/digestive-
disorders/tc/constipation-age-12-and-older-home-treatment>.