Shri Gosavi Amol Shivaji Asst Teacher 7 th

Shri. Gosavi Amol Shivaji (Asst. Teacher) 7 th Science PPT Guidence – Sou. Jadhav V. B. (Hm)

Standard : - th 7 Subject : - Science 13. FOOD AND NUTRITION

FOOD AND NUTRITION

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

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 Saliva contains mucus that keeps the mouth moist and lubricates food for easier swallowing

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

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

Digestion and Digestive Juices Saliva GASTRIC JUICE PANCREATIC JUICE

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

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

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

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