1. Standard :- 7th Subject :- Science 13. FOOD AND NUTRITION Std. 7 th
Rayat Shikshan Sanstha , Karmveer Vidhyaprabhodhini Madhya Vibhag ,Satara
Standard :- 7th
Subject :- Science
13. FOOD AND NUTRITION
Std. 7 th
Sub. Science
Unit FOOD AND NUTRITION

2. FOOD AND NUTRITION

3. 1. Parts of The Alimentary Canal
The alimentary canal (or gut) is the tube within the body through which food passes and is processed in various ways

4. 2. Role of the Mouth Teeth assist the mechanical breakdown of food
Saliva is mixed with food during chewing
Saliva contains the enzyme amylase which starts the digestion of food
Salivary gland
Saliva contains mucus that keeps the mouth moist and lubricates food for easier swallowing
Salivary gland
Salivary gland

5. 3. Muscles of the Alimentary Canal
Food has to be kept moving along the alimentary canal whilst being mixed with various juices
These actions are brought about by muscles in the walls of the canal over which a person has little or no conscious control

6. Digestion
‘the breakdown of large insoluble molecules into soluble molecules’

7. Digestion and Digestive Juices
Saliva
GASTRIC JUICE
Bile
PANCREATIC JUICE
INTESTINAL JUICE

8. Sites of production of main digestive juices
Site of digestive juice production
Main digestive juice produced
Mouth
Saliva
Stomach
Gastric juice
Liver
Bile (breaks down big fat droplets into little fat droplets
Pancreas
Pancreatic juice
Small Intestine
Intestinal juice

9. Digestion and Digestive Juices
SALIVA
Salivary amylase
GASTRIC JUICE
Hydrochloric acid
Pepsin (protease)
Bile
PANCREATIC JUICE
Pancreatic lipase
INTESTINAL JUICE

10. In the Mouth… Starch maltose
Broken down into glucose later by other amylases
Salivary amylase

11. In the stomach Protein peptides
Broken down into amino acids later by other proteases
pepsin

12. In the pancreas….
Fats fatty acids and glycerol
Pancreatic lipase

13. After all the digestive enzymes have done their work…
Glucose
Amino acids
Fatty acids
Glycerol

14. Annasaheb Kalyani Vidyalaya , Camp Satara
Rayat Shikshan Sanstha , Karmveer Vidhyaprabhodhini Madhya Vibhag ,Satara
Created By –
Annasaheb Kalyani Vidyalaya , Camp Satara
Std. 7 th
Sub. Science
Unit FOOD AND NUTRITION