Republic of the Philippines
Department of Education
REGION VII-CENTRAL VISAYAS
SCHOOLS DIVISION OF SIQUIJOR
CABULIHAN INTEGRATED SCHOOL-SECONDARY
CANGMALALAG, LARENA, SIQUIJOR
School Year 2023—2024
NAME OF SCHOOL: Cabulihan Integrated School
TEACHER: Albert C. Umbac
TITLE: Journey to the Digestive System
LEAST LEARNED COMPETENCY: Explain ingestion, absorption, assimilation
and excretion
SCRIPT FOR: Journey to the Digestive System
FADE IN:
Ohh my gosh. I’m hungry.
Do you know the reason why we need to eat?
Or are you curious as to what happens to the food that you ate once it
enters your mouth?
If you do, then come along with me as we journey to the world of the
digestive system.
Hi I’m teacher Albert. And I will be your guide for today’s lesson.
The digestive system is a network of organs that helps you digest and
absorb nutrition from your food (“Digestive System,” 2023). Because food plays
a vital role for the survival of an organism, the energy needed to carry out life
processes must be properly obtained.
So where does digestion start?
Digestion starts in the mouth. In the mouth both mechanical and chemical
digestion occur. Mechanical digestion is the process where food is broken down
1
into smaller pieces with the help of the teeth and other ancillary digestive organs
like the tongue and gums.
On the other hand, chemical digestion is digestion with the use of
enzymes that speed up chemical reactions. Specifically, our saliva contains
salivary amylase an enzyme that helps break down carbohydrates.
After the food has been ingested in the mouth, where does it go next?
Food that passes in the mouth will now go to the esophagus. The
esophagus moves the partially digested food, now called bolus, down to the
stomach through a series of muscular contractions within the esophagus called
peristalsis.
Ohh I see! That’s how the esophagus works. Then what happens to the
food once it enters the stomach?
Once the food enters the stomach, chemical digestion continues. The
stomach is a hollow organ or container that holds the food while it is being mixed
with the digestive enzymes. Enzymes such as protease and lipase help break
down proteins and lipids. Moreover, the stomach also secretes a very strong
acid, the gastric acid, which further breaks down food into smaller pieces.
Digested food in the stomach is now called chyme.
The chyme now passes through the small intestine where digestion ends.
The small intestine is approximately 22-feet long and breaks down food using
enzymes released by the pancreas and bile from the liver. It is made up of three
segments—duodenum, jejunum, and ileum. The duodenum continuously does
the breaking-down process while the jejunum and ileum are responsible for the
absorption of water and nutrients into the bloodstream.
The journey of food doesn’t stop in the small intestine. After absorption
and assimilation of nutrients, the food now called stool or waste, enters the large
intestine which is approximately six feet long. Reabsorption of water takes place
2
in the colon and good bacteria perform several useful functions such as the
production of vitamins and the eradication of harmful bacteria.
Now the journey of food will come to end. Stool from the colon will be
passed to the rectum and anus for excretion. Excretion is the process of
eliminating digestive waste from the body through the rectum and anus. Both
the rectum and anus are made up of voluntary muscles that help contain and
hold the waste. Otherwise, we would be pooping involuntarily. And that’s
disgusting!
And that ends our journey to the digestive system.
Always remember that the food that you eat gives you energy, so eat
healthy and always stay healthy. Goodbye!
DISSOLVE TO:
THE END!
REFERENCES:
Campo et. al., (2013). Science 8 Learner’s Guide. Pasay City.
Cleveland Clinic. (2023). Digestive System.
https://my.clevelandclinic.org/health/body/7041-digestive-system
MUSIC
Bensound. (2023).
https://www.bensound.com
IMAGES and VIDEOS
Canva. (2023).
https://www.canva.com
