DEPARTMENT OF EDUCATION
Division of Davao City
STA. ANA NATIONAL HIGH SCHOOL
D. Suazo St., Davao City
Date of Implementation: January 19, 2018
Code: S8LT-IVa-13
Duration: 50 minutes
Grade: 8
LEARNING OBJECTIVE:
At the end of the period, the learner are able to:
Cognitive: Describe the Different organs of digestion.
Psychomotor: Identify the function of each organ in the digestive process.
Affective: Acquire knowledge and apply things learned for everyday living.
SUBJECT MATTER:
Domain: Structure and Functions: The Digestive System
Topic: The Different Organs of Digestion
Learner Competency: Explain ingestion, absorption, assimilation, and excretion.
Skill/s: Observing, Describing and Identifying
Values: Awareness and Cooperation
Materials: Cartolina, pictures, Manila paper, Scotch Tape
References: EASE Biology. Module 1. Lesson 1, Science and Technology II: Biology
Textbook. NISMED 2012...pp.99; 109-110, Science Links Module
https://www.slideshare.net/maryjane0116/the-different-organs-of digestion?
qi=e851b6f7-fce7-4410-b767-c49940e140e7&v=&b=&from search=1
LESSON PROPER:
Preliminaries:
Cleaning
Praying
Greeting
Presentation of Learning Objective
Review
The trends in the Periodic Table ask question such us;
What is in the elements that can be a basis for grouping?
Motivation/Explore
Show them pictures of a boy and girl who is eating and ask questions such
us;
-What have you eaten today?
-What happened to your food after you ate it?
-How does our body get nutrients from the food we eat?
4 A’s
ACTIVITY
“Complete me”
Instruction 1. The class will be divided into four groups and each group will choose one
representative to go in front and get one envelope. The envelope contains of a puzzle that they
need to arrange within 5 minutes, together with the puzzle there is a white rolled paper in where
there is a task to be done and all answer should be written in Manila paper afterwards all output
of the group will be posted on the blackboard.
The task are;
Group 1-Make a list of digestive organs found in the human body.
Group 2- State the function of each digestive organs
Group 3-Trace the pathway of food in the digestive system. Consider the tracing s traffic
directions where the digestive organs serves as streets to pass by.
Group 4-Idenify the accessory organs of the digestive organs. Explains why they are called
accessory and explain their role
Rubrics
CATEGORY 10 8 6 4 2
Content Shows a full Shows a good Shows a goodDoes not Does not seem
understanding understanding understanding
seem to to understand or
of the topic a the topic of parts of the
understand address any
topic the topic very topic.
well.
Cooperation All members Some Only few Very few No members of
of the group members of members of members of the group
contributes on the group the group the group contributes on
the said contributes on contributes on contributes on the said activity.
activity. the said the said the said
activity. activity. activity.
Total 20
points
2. ANALYSIS
How do you find the Activity?
3. ABSTRACT/GENERALIZATION
Digestion is the process by which food is broken down into smaller components that body can
absorb to nourish its cell.
Functions of the Digestive System are;
Ingestion or taking in food into the mouth
Digestion and absorption – processing of food into a form that will be assimilated into the
living cells
Excretion 0r elimination of indigested substances and certain wastes
Phases of Digestion
• Mechanical phase – chewing or mastication
• Chemical phase – enzymes are secreted together with the digestive juices
Two Main Parts of the Digestive System
• Digestive or alimentary tract – (mouth, pharynx, esophagus, stomach, small and large
intestines, rectum and anus)
• Accessory organs – (salivary glands, liver, gallbladder and pancreas)
Mouth
Digestion begins; entrance of food
Teeth – break down food into small pieces
Tongue – muscular organ; mixes food with the saliva, aids in swallowing
Salivary glands – secrete saliva that lubricates food
Saliva – contains enzymes that help in the chemical digestion of carbohydrates
Mechanical and chemical digestion of food
Bolus – a lubricated, chewed, ball- shaped mass of food
Pharynx
Throat
- Located posterior to the mouth
- Common passage way for digestion and respiration,
- Breathing and swallowing do not happen at the same time
Cardiac sphincter – a circular muscle valve at the upper end of the stomach, relaxes to
allow the food into the stomach
Epiglottis – prevents the bolus from entering the trachea
Esophagus
muscular tube through which food passes from pharynx to the stomach
Peristalsis – a series of rhythmic wavelike contractions of the muscles of the esophagus
to push down food into the stomach.
Stomach
expanded organ located between the esophagus and small intestine
muscular, elastic , pear-shaped organ • storing of the swallowed food • mixing food with
the digestive juice it produces
conveying its contents slowly into the small intestine
Pyloric sphincter – circular valve muscle at the lower end of the stomach that remains
closed when food enters the stomach
Chyme – semifluid partially digested food
Small Intestine
• Three parts:
1. Duodenum,
2. Jejunum
3. Ileum
organ of complete digestion • secretes enzymes that change food materials into their
simplest components
longest organ of the digestive system
Intestinal Villi – very tiny projection that increase the absorbing capacity of the small
intestine
Large Intestine
the next organ after the small intestine
the larger organ because of its diameter
temporary stores fecal materials • absorbs vitamins produced by certain symbiotic
bacteria in the colon • reabsorbs water from the undigested residue
Has three distinct part:
Ascending colon
Transverse colon
Descending colon
cecum – the proximal part of the ascending colon; a blind sac that bears the vermiform
appendix •
Sigmoid colon – named because it is somewhat S-shaped
Rectum
-The last part of the large intestine
Anus - lower opening that functions as exit point for fecal material
defecation or bowel movement – the process of propelling the feces out of the body
through the anus controlled by a sphincter in the brain
Accessory Organs Salivary Glands
located in the mouth
Three types:
1. Parotid
2. Sublingual
3. Submandibular
Accessory Organs Salivary Glands
saliva – secreted by the salivary gland; a chemical substance that is a combination
of watery fluid and mucus • mucus part lubricates the mouth that aids in
swallowing • serous part contains salivary amylase ptyalin that digests
carbohydrates in the mouth
Accessory Organs Liver and Gallbladder
Largest organ in the body
• produces bile from bilirubin, a waste product formed when red blood cells are
being destroyed
Two important functions:
emulsification of fats and neutralization of the partly digested food from the
stomach
gallbladder – stores the bile
500 – 1,000 ml 0f bile is stored and concentrated in the liver daily
Accessory Organs Pancreas
large, elongated gland that lies posterior to the stomach
a yellowish organ that functions as exocrine and endocrine gland
Islets of Langerhans – the endocrine part; secrete hormones important in the
metabolism of sugar
Pancreatic acini – the exocrine part; secrete the digestive enzymes directly into
the duodenum
Amylopsin, trypsin, steapsin and nuclease – secreted by the acinar cells system.
APPLICATION
What is the significance of learning the different organs of digestion?
Evaluation
Part I
Instruction: Choose the best answer. Write the letter of your best choice on the blank before the
number.
________1.Which of the following is NOT a function of the liver?
A.Production of Bile
B.Storage of Glucose
C.Storage of Vitamins
D.Detoxification of Drugs
________2.The gall bladder
A.Produces bile
B.Is attached to the pancreas
C. Stores concentration bile
D. Produces cholecystokinin
_______ 3.The small fingerlike organ located where the small and large intestines join is the_
A.Appendix
B.Sphincter muscle
C. Epiglottis
D. Ileum
_______4.The largest internal organ in the body is the ___
A.Stomach
B.Large intestine
C.Liver
D. Pancreas
_______5. Food is completely digested and absorbed in what organ?
A.Stomach
B. Large Intestine
C.Small Intestine
D. Liver
_______6.All of the following enzymes are found in the small intestine except?
A.Ptyalin
B. Nuclease
C.Steapsen
D. Amino Peptidase
_______7. What is the purpose of eating food??
A.Ingestion
B. Digestion
C.Absorption
D. All of the above
_______8. Where does digestion start?
A.Mouth
B. Stomach
C.Small Intestine
D. Large Intestine
_______9. What does the salivary gland secrete?
A.Saliva
B. Amylase
C.Pepsin
D.Both A and B
_______10. The stomach does what??
A. Churns the food into chime.
B. Breaks down fats
C. Releases pepsin and protease
D. All of the above
Assignment:
Study in advance about the different Enzymes in the Digestive.
Prepared by: Checked by:
MAREVIC B. ESCALERA MRS.KEMBERLY N. LEE
Pre-service Teacher Science 8 Subject Teacher
