Introduction
What is the digestive system?
The digestive system is made up of the gastrointestinal tract—also called the GI tract or digestive tract—and the liver, pancreas, and gallbladder. The GI tract is a series of hollow organs joined in a long, twisting tube from the mouth to the anus. The hollow organs that make up the GI tract are the mouth, esophagus, stomach, small intestine, large intestine, and anus. The liver, pancreas, and gallbladder are the solid organs of the digestive system.
The small intestine has three parts. The first part is called the duodenum. The jejunum is in the middle and the ileum is at the end. The large intestine includes the appendix, cecum, colon, and rectum. The appendix is a finger-shaped pouch attached to the cecum. The cecum is the first part of the large intestine. The colon is next. The rectum is the end of the large intestine.
Task
Direction: Read and answer the following questions. Encircle the correct answer.
1. Your salivary glands are a mixture of secretions that help break down food.
A. True
B. False
2. Your esophagus is not synchronized to move food down to the stomach.
A. True
B.False
3. The pancreas makes enzymes that help break down proteins, carbohydrates and fats.
A. True
B. False
4. The stomach has mucus that replaces itself every two weeks because of the harsh acid in the stomach.
A. True
B. False
5. The Digestive System begins in the nose.
A. True
B. False
6. What are the organs that work together to break down food called?
A. The lymphatic system
B. The digestive system
C. The alimentary system
D. The intestinal system
7. How does chewing help digestion?
A. Chewing makes food taste better.
B. Chewing makes food last longer.
C. Chewing makes food smaller.
D. Chewing makes it harder for bacteria to grow
8. What has an enzyme that starts digesting carbohydrates as you chew?
A. Incisors
B. Saliva
C. Gums
D. Esophagus
9. Why is the small intestine called "small"?
A. It is short.
B. It is small in diameter/
C. It doesn't hold much.
D. It doesn't weigh much.
10. What do the villi in the small intestine do?
A. Kill bacteria
B. Protect the small intestine
C. Absorb nutrients
D. It is small in diameter
Process
Each part of your digestive system helps to move food and liquid through your GI tract, break food and liquid into smaller parts, or both. Once foods are broken into small enough parts, your body can absorb and move the nutrients to where they are needed. Your large intestine absorbs water, and the waste products of digestion become stool. Nerves and hormones help control the digestive process.
The digestive process
Mouth--Esophagus--Stomach--Small intestine--Large intestine--Rectum
Food moves through your GI tract by a process called peristalsis. The large, hollow organs of your GI tract contain a layer of muscle that enables their walls to move. The movement pushes food and liquid through your GI tract and mixes the contents within each organ. The muscle behind the food contracts and squeezes the food forward, while the muscle in front of the food relaxes to allow the food to move.
Mouth. Food starts to move through your GI tract when you eat. When you swallow, your tongue pushes the food into your throat. A small flap of tissue, called the epiglottis, folds over your windpipe to prevent choking and the food passes into your esophagus.
Esophagus. Once you begin swallowing, the process becomes automatic. Your brain signals the muscles of the esophagus and peristalsis begins.
Stomach. After food enters your stomach, the stomach muscles mix the food and liquid with digestive juices. The stomach slowly empties its contents, called chyme, into your small intestine.
Small intestine. The muscles of the small intestine mix food with digestive juices from the pancreas, liver, and intestine, and push the mixture forward for further digestion. The walls of the small intestine absorb water and the digested nutrients into your bloodstream. As peristalsis continues, the waste products of the digestive process move into the large intestine.
Large intestine. Waste products from the digestive process include undigested parts of food, fluid, and older cells from the lining of your GI tract. The large intestine absorbs water and changes the waste from liquid into stool. Peristalsis helps move the stool into your rectum.
Rectum. The lower end of your large intestine, the rectum, stores stool until it pushes stool out of your anus during a bowel movement.
To understand more the digestive system click and watch the video.
https://www.niddk.nih.gov/health-information/digestive-diseases/digesti….
Evaluation
| Criteria | 4 | 3 | 2 | 1 |
| Student can identify the functions of digestive system | ||||
| Students can enumerate the digestive system | ||||
| The students know the process of digestive system | ||||
| The data given was accurate and clear to students understand easily |
Conclusion
At the end of the lesson, students are expected to learn and memorize the parts and the process of digestive system. In the lesson provided they we teach the parts of digestive system and how it moves or work. It has a process that start from what you put in your mouth and ended to your rectum. In addition, they were provided option which is the attach video link where they could see how the digestive system works. Moreover, as they were given accurate information and amount of time to study students should be able to answer the given assessment. The assessment provided will help students remember and sharpen their mind on how far do they learn and memorize to the topic.
In the other hand, as their teacher I will encourage my student to see the video which will gonna help them understand more the lesson especially in this state of learning and teaching process right now. Thus, students should be cooperative in all the instructions and given assessment by the teacher.
Credits
Teacher Page
Jan Carlo B. De La Rama BEED2
Grade IX-Science Teacher