Nutrition in Animals Class 7 Ch 2

PPT on Nutrition in Animal class:7 chapter:2
Made by Pratyaksh

1. Science Chapter-2 Nutrition in Animals

2. Nutrition: The process of taking in food by an organism and its utilisation by the body. Nutrition in animals takes place in five steps.

3. Digestion in Human beings

4. Human digestive system consists of alimentary canal and its associated glands . The main organs of the alimentary canal are: The Mouth (Oral cavity) Oesophagus. Stomach. Small intestine. Large intestine. The associated glands are: Salivary gland Liver Pancreas

5. Mouth Food is taken into the body through mouth. It contains teeth, tongue, salivary glands. Dental formula for permanent teeth-   Type of teeth Function   Incisors   Used for cutting   Canines   Used for tearing   Premolars   Used for Chopping   Molars  Used for Grinding and Chewing

6. Tongue helps in- tasting the food speaking swallowing the food Mixes the food with saliva making the food soft  Salivary glands secrete watery liquid called saliva that helps to digest starch partially.

7. Also known as food pipe Carries slightly digested food from mouth to stomach. Food moves forward by peristaltic movement ( Wave like movement caused by alternate contraction and relaxation of muscles of alimentary canal) Oesophagus

8. Stomach Thick walled bag present on the left side of the abdomen. Secretes mucous, hydrochloric acid and digestive juices. Mucous protects the inner lining of the stomach from HCl acid. Hydrochloric acid kills the bacteria and makes the medium acidic that helps digestive juices(enzymes) to act. Digestive juices breaks down protein into simpler substances.

9. Small Intestine Receives secretions from liver and pancreas . Besides its walls also secrete digestive juices. Liver secretes bile juice that is stored in gall bladder before entering small intestine. That helps in digestion of fats. Pancreas releases pancreatic juice that acts on carbohydrates, fats and proteins and converts them into simpler substances along with intestinal juice.

10. Absorption in Small Intestine

11. Large Intestine absorbs back water  and any remaining absorbable nutrients from the food. sends the indigestible matter to the rectum where it is temporarily stored and thrown out of the body through anus by the process of egestion.

12. NUTRITION IN AMOEBA