Digestive System
By: Benzel Karl P. Quilbio, LPT
Digestive System
Q4
Science 8
WEEK 1
By: Benzel Karl P. Quilbio, LPT
S8LT-IVa-13
MELCs:
OBJECTIVES:
MELCs:
Explain ingestion, absorption, assimilation, and excretion
OBJECTIVES:
 describe the role of organ System
 experiment on a certain food to obtain information on the following:
a. mechanical digestion
b. chemical digestion
 describe how the upper and lower gastrointestinal tracts work
 explain how digestive system perform the following functions:
a. ingestion
c. absorption e. egestion
b. digestion
d. assimilation
REVIEW:
LET US PLAY!
LET US PLAY!
ANSWER
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ACTIVITY: Experiment time
Make sure you have the materials!
• Biscuit
• A sheet of paper for recording
• Ball pen
RECORD TABLE
FOOD ITEM
BISCUIT
1. What organs are
involved in chewing
the soda cracker?
2. What do you think
happened to the soda
cracker in your mouth?
TASTE OF FOOD
BEFORE CHEWING
AFTER CHEWING
ANALYSIS: Guide Questions
ANALYSIS: Guide Questions
ANALYSIS: Guide Questions
• Can you name the organs where the food passes
through as you chew?
• What do you think is the role of your teeth?
• What do you think is the role of your saliva?
• Does chewing it considered mechanical digestion
or chemical digestion?
• Can you name some chemicals involved on the
breakdown of the food that you just ate?
ABSTRACTION
ABSTRACTION
Mouth
(Ingestion)
• Mastication
(mechanical
digestion)
• Release of enzyme
ABSTRACTION
Bolus
ABSTRACTION
Esophagus
• Movement of
muscle
(peristalsis)
Bolus
ABSTRACTION
• Release on enzyme
(pepsin) to break
protein.
Stomach
Chyme
ABSTRACTION
Pancreas
• Located below the
stomach.
• Releases
pancreatic juice to
the small intestine.
ABSTRACTION
Liver
• Releases bile
• Bile- breaks fats
and remove
toxins.
ABSTRACTION
• Stores bile
• Releases bile in
small intestine.
Gallbladder
ABSTRACTION
• Absorbs
nutrients
through villi.
Small intestine
(absorption)
ABSTRACTION
• Digested food
move inside the
cell.
Cell absorption
(assimilation)
ABSTRACTION
Large intestine
• Reabsorbs water
that was not
absorbed by
small intestine
ABSTRACTION
• Feces moves out of the body
Anus (egestion)
APPLICATION: Labeling
a. Anus
b. Esophagus
c. Gall bladder
d. Large intestine
e. Liver
f. Mouth
g. Pancreas
h. Rectum
i. Small intestine
j. Stomach
APPLICATION: Labeling
Mouth
a. Anus
b. Esophagus
c. Gall bladder
d. Large intestine
e. Liver
g. Pancreas
h. Rectum
i. Small intestine
j. Stomach
APPLICATION: Labeling
Mouth
Esophagus
a. Anus
c. Gall bladder
d. Large intestine
e. Liver
g. Pancreas
h. Rectum
i. Small intestine
j. Stomach
APPLICATION: Labeling
Mouth
Esophagus
Stomach
a. Anus
c. Gall bladder
d. Large intestine
e. Liver
g. Pancreas
h. Rectum
i. Small intestine
APPLICATION: Labeling
Mouth
Esophagus
Stomach
Pancreas
a. Anus
c. Gall bladder
d. Large intestine
e. Liver
h. Rectum
i. Small intestine
APPLICATION: Labeling
Mouth
Esophagus
Liver
Stomach
Pancreas
a. Anus
c. Gall bladder
d. Large intestine
h. Rectum
i. Small intestine
APPLICATION: Labeling
Mouth
Esophagus
Liver
Gall bladder
Stomach
Pancreas
a. Anus
d. Large intestine
h. Rectum
i. Small intestine
APPLICATION: Labeling
Mouth
Esophagus
Liver
Gall bladder
Small intestine
Stomach
Pancreas
a. Anus
d. Large intestine
h. Rectum
APPLICATION: Labeling
Mouth
Esophagus
Liver
Gall bladder
Small intestine
Stomach
Pancreas
Large
intesti
ne
a. Anus
h. Rectum
APPLICATION: Labeling
Mouth
Esophagus
Liver
Gall bladder
Small intestine
Stomach
Pancreas
Large
intestine
Rectum
Anus
APPLICATION: Labeling
Mouth
Ingestion
Esophagus
Liver
Gall bladder
Small intestine
Digestion
&Assimilation
Stomach Digestion
Pancreas
Large intestine
Absorption
Rectum
Anus
Egestion
ASSIGNMENT
III. Enrichment
Answer the multiple-choice assessment
(Test Yourself) on your book page 235-238
Reference:
Ferrioles, J., Ramos, A. C., & Silvero, A. A. (2019) Exploring life
through
Science: The new Grade 8. Quezon City:
Phoenix Publishing House. Pages 273-27&280-282