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Presentation lesson in science 8 digestive system

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Mary Grace Lemon

The document discusses the digestive system and provides information on each part of the GI tract, including their functions and the multi-step process of digestion from the mouth through the small and large intestines. It also covers the accessory organs of the liver, gallbladder and pancreas. The document aims to educate on the digestive system through text, diagrams, questions, and an assignment for students to list healthy practices related to digestive care.

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Presentation lesson in science 8 digestive system
Presentation lesson in science 8 digestive system
ACTIVITY 1: Puzzle No more
• Objective: • After performing this activity, you should be able to identify the nutritional disorders caused by nutrient deficiency. • Procedure: • 1. Complete the picture by solving the puzzle. • 2. Arrange the letters to identify the disease. Some letters have corresponding numbers as your guide. • 3.You have only 2 minutes to finish your activity.
•In an article in businessmirror.com written by Claudeth Mocon-Ciriaco on February 7, 2019, according to a recent study by the Food and Nutrition Research Institute (FNRI), the current chronic malnutrition rate among Filipino children aged 0 to 2 is at 26.2 percent, the highest in 10 years. So, out of 100 children aged 0 to 2, how many suffers from malnutrition?
Presentation lesson in science 8 digestive system
Presentation lesson in science 8 digestive system
Presentation lesson in science 8 digestive system
• The digestive system is made up of the gastrointestinal tract— also 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 down to the anus. The hollow organs that make up the GI tract are the mouth, esophagus, stomach, small intestine, large intestine, and anus. Liver, pancreas, and gallbladder are the solid organs of the digestive system.
• Digestion begins when food enters the(oral cavity) mouth . In which mechanical and chemical digestion occurs.Teeth break up and grind food (mechanical), while an enzyme in saliva called amylase begins to break down carbohydrates (chemical).
• After the food is swallowed, the chewed food (now called a bolus) moves down to the esophagus.The esophagus acts as a connection between the mouth and stomach.
• The bolus that reaches the stomach, where more chemical and mechanical digestion take place. Muscles in the stomach walls churn the bolus (mechanical), allowing to mix it with gastric acids(chemical and digestive enzymes.This process changes the bolus into liquid called chyme.
• Digestion continues for several hours in the stomach.This time, an enzyme called pepsin breaks down most of the protein in the food. Slowly the chyme transported into the small intestine, where most chemical digestion takes place. Bile, which is made in the liver, is released from the gallbladder, helps digest fats. Enzymes from the pancreas and intestinal walls together with the chyme starts the final part of digestion. • What remains of the food when it reaches the end of the ileum is a combination of water, electrolytes — such as sodium and chloride — and waste products, such as plant fiber and dead cells shed from the lining of your digestive tract. • This is where absorption of chemicals and nutrients from the food takes place.
Large Intestine As this residue passes through the colon, nearly all of the water is absorbed, leaving a usually soft but formed substance called stool. Muscles in the wall of your colon separate the waste into small segments that are pushed into your lower colon and rectum. As the rectal walls are stretched, they signal the need for a bowel movement. When the sphincter muscles in your anus relax, the rectal walls contract to increase pressure. These coordinated muscle contractions expel the stool.
THE ACCESSORY ORGANS OF OUR DIGESTIVE SYSTEM Pancreas - pancreatic juices is secreted to help in digestion of proteins and carbohydrates. Gallbladder – It stores bile that is produced by the liver. Liver - creates bile for fat digestion, processes absorbed vitamins and detoxifies blood. Salivary glands - moisten food and begin chemical digestion of starches.
• 1.Teenagers like you sometimes do not eat breakfast and drink sodas and junk foods for snack. Do you think it is healthy? • 2. What part of your digestive system will be first affected if you continually do that habit for a long time? • 3. Do you think it will lead to a more serious illness like colon cancer?
Presentation lesson in science 8 digestive system
Presentation lesson in science 8 digestive system
A. MatchingType: Match the following functions (Column A) to its respective organs (Column B) in the digestive system. Colum A Column B ___1. Stores the stool from the colon A. Esophagus ___2. Propels or pushes food to the stomach B. Anus ___3. Ingests and chews food C. Small intestine ___4.Absorbs breakdown products of carbohydrates, proteins, lipids and nucleic acids D. Stomach ___5. Produces bile for fat digestion and elimination E. Large Intestine ___6. Solidify the waste products by absorbing water F. Mouth ___7. Secretes acid and enzymes that transform food into creamy fluid called chyme G. Liver ___8.An opening which solid waste passes and eliminated. H. Rectum I. Pancreas
B. Illustration: Indicate the missing parts to correct order of the food pathway from ingestion to excretion.
Assignment • In your activity notebook, list down health practices related to the care of our digestive system.
Presentation lesson in science 8 digestive system

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Presentation lesson in science 8 digestive system

  • 4. • Objective: • After performing this activity, you should be able to identify the nutritional disorders caused by nutrient deficiency. • Procedure: • 1. Complete the picture by solving the puzzle. • 2. Arrange the letters to identify the disease. Some letters have corresponding numbers as your guide. • 3.You have only 2 minutes to finish your activity.
  • 5. •In an article in businessmirror.com written by Claudeth Mocon-Ciriaco on February 7, 2019, according to a recent study by the Food and Nutrition Research Institute (FNRI), the current chronic malnutrition rate among Filipino children aged 0 to 2 is at 26.2 percent, the highest in 10 years. So, out of 100 children aged 0 to 2, how many suffers from malnutrition?
  • 9. • The digestive system is made up of the gastrointestinal tract— also 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 down to the anus. The hollow organs that make up the GI tract are the mouth, esophagus, stomach, small intestine, large intestine, and anus. Liver, pancreas, and gallbladder are the solid organs of the digestive system.
  • 10. • Digestion begins when food enters the(oral cavity) mouth . In which mechanical and chemical digestion occurs.Teeth break up and grind food (mechanical), while an enzyme in saliva called amylase begins to break down carbohydrates (chemical).
  • 11. • After the food is swallowed, the chewed food (now called a bolus) moves down to the esophagus.The esophagus acts as a connection between the mouth and stomach.
  • 12. • The bolus that reaches the stomach, where more chemical and mechanical digestion take place. Muscles in the stomach walls churn the bolus (mechanical), allowing to mix it with gastric acids(chemical and digestive enzymes.This process changes the bolus into liquid called chyme.
  • 13. • Digestion continues for several hours in the stomach.This time, an enzyme called pepsin breaks down most of the protein in the food. Slowly the chyme transported into the small intestine, where most chemical digestion takes place. Bile, which is made in the liver, is released from the gallbladder, helps digest fats. Enzymes from the pancreas and intestinal walls together with the chyme starts the final part of digestion. • What remains of the food when it reaches the end of the ileum is a combination of water, electrolytes — such as sodium and chloride — and waste products, such as plant fiber and dead cells shed from the lining of your digestive tract. • This is where absorption of chemicals and nutrients from the food takes place.
  • 14. Large Intestine As this residue passes through the colon, nearly all of the water is absorbed, leaving a usually soft but formed substance called stool. Muscles in the wall of your colon separate the waste into small segments that are pushed into your lower colon and rectum. As the rectal walls are stretched, they signal the need for a bowel movement. When the sphincter muscles in your anus relax, the rectal walls contract to increase pressure. These coordinated muscle contractions expel the stool.
  • 15. THE ACCESSORY ORGANS OF OUR DIGESTIVE SYSTEM Pancreas - pancreatic juices is secreted to help in digestion of proteins and carbohydrates. Gallbladder – It stores bile that is produced by the liver. Liver - creates bile for fat digestion, processes absorbed vitamins and detoxifies blood. Salivary glands - moisten food and begin chemical digestion of starches.
  • 16. • 1.Teenagers like you sometimes do not eat breakfast and drink sodas and junk foods for snack. Do you think it is healthy? • 2. What part of your digestive system will be first affected if you continually do that habit for a long time? • 3. Do you think it will lead to a more serious illness like colon cancer?
  • 19. A. MatchingType: Match the following functions (Column A) to its respective organs (Column B) in the digestive system. Colum A Column B ___1. Stores the stool from the colon A. Esophagus ___2. Propels or pushes food to the stomach B. Anus ___3. Ingests and chews food C. Small intestine ___4.Absorbs breakdown products of carbohydrates, proteins, lipids and nucleic acids D. Stomach ___5. Produces bile for fat digestion and elimination E. Large Intestine ___6. Solidify the waste products by absorbing water F. Mouth ___7. Secretes acid and enzymes that transform food into creamy fluid called chyme G. Liver ___8.An opening which solid waste passes and eliminated. H. Rectum I. Pancreas
  • 20. B. Illustration: Indicate the missing parts to correct order of the food pathway from ingestion to excretion.
  • 21. Assignment • In your activity notebook, list down health practices related to the care of our digestive system.