Digestive system - CLASS V

Digestive system
CLASS V
SCIENCE
INTERNATIONAL BOARD
IGCSE

1. Hi, My name is Sonu Hi, My name is Monu

2. Digestive System Class V D

3. All livin g things are made up of cells . A cell is the smallest unit of life. Cells

4. A collection of the same kind of cells forms a tissue . TISSUE

5. Tissues make up organs such as your eyes, your stomach and your heart. ORGAN

6. Several organs work together to form a body system . BODY SYSTEM

7. DIGESTION The process of breaking down food into simpler substances that the body can use is called digestion.

8. Our digestive system is made up of a long, twisting tube that starts from the mouth and ends at the anus . This long twisting tube is called an alimentary canal or digestive tract .

9. Organs in Digestive system

10. MOUTH Match the column A with column B A: Part of mouth Teeth Tongue Salivary gland B: Function roll the food into tiny balls to be pushed into the oesophagus moistens and softens the food grinds the food

11. MOUTH Teeth grinds the food Tongue helps to roll the food into tiny balls to be pushed into the oesophagus (gullet). Salivary gland moistens and softens the food

12. Oesophagus Oesophagus is long muscular tube –(8 inches long) that joins from mouth to stomach The muscles in the oesophagus contract and relax to cause wave-like movements. These movements allow the food to move into the stomach. These movements of muscles in the oesophagus are called peristalsis movement.

13. Stomach J- Like or Bag-like shape Stores the food for 3-4 hours. The food is mixed with digestive juices and acid that are secreted from the stomach wall. The muscular stomach walls then help churn this mixture of food, and digestive juices. The stomach then empties this liquid into the small intestine (Liquid - chyme)

14. Small Intestine • As the partially digested food enters the small intestine. It is mixed with the more digestive substances produced by the pancreas and liver. • Digestion ends in the small intestine, Nutrients from the digested food are absorbed by the walls of the small intestine and enter the bloodstream. • The blood then transports the nutrients to all the parts of the body.

15. Accessory Organs The salivary glands, liver, gallbladder, and pancreas are not part of the digestive tract, but they have a role in digestive activities and are considered accessory organs. • The pancreas is a gland which secrete pancreatic juice that helps in the digestion of food in the small intestine. • The pancreas is about 6 inches long and located behind the stomach.

16. Liver • Largest gland in the body • Bile is a digestive juice that is secreted by the liver and stored in the gall bladder. • It stores and controls chemicals and removes toxic substances.

17. Large Intestine • The undigested food that is not absorbed passes into the large intestine. • Water from the undigested food is absorbed by the walls of the large intestine. • Solid waste is thus formed and processed into faeces.

18. Rectum Faeces are stored in the rectum until they are ready to be released.

19. Anus The faeces are expelled from the body by the anus

20. QUIZ All livin g things are made up of ______. cells t issue Organs body system Ans. a) cells A collection of the same kind of cells forms a _____. cells t issue Organs body system Ans. b ) t issue

21. QUIZ Several organs work together to form a ________. cells t issue Organs body system Ans. d) body system Our digestive system is made up of a long, twisting tube that starts from the mouth and ends at the anus. This long twisting tube is called an ________. alimentary canal Small intestine large intestine body system Ans. a) alimentary canal

22. QUIZ Largest gland in the body Rectum Liver Stomach Tissue Ans. d) Liver The undigested food that is not absorbed passes into the _______. alimentary canal Small intestine large intestine body system Ans. c ) large intestine