mode of nutrition

• Small intestine


  • Has three parts: the duodenum, jejunum, and ileum
  • Helps to further digest food coming from the stomach
  • Absorbs nutrients (vitamins, minerals, carbohydrates, fats, proteins) and water from food so they can be used by the body
  • Part of the digestive system

  
• The length of the small intestine is approximated by three times the length of the infant, or height of the child or adult
• Duodenum

  About 25 cm (10 inches) long
• Jejunum


  About 2.5 m (8 feet) long
• Ileum


  About 3.6 m (12 feet) long
• The small intestine is the part of the intestines where 90% of the digestion and absorption of food occurs, the other 10% taking place in the stomach and large intestine

  
• Nutrition


  The process of obtaining food required to obtain energy to carry out life processes

  
• Major modes of nutrition

  • Autotrophic nutrition
  • Heterotrophic nutrition

  
• Plants and animals do not obtain food by the same processes
• Plants and some bacteria have the green pigment chlorophyll to help synthesize food, while animals, fungi and other bacteria depend on other organisms for food
• Main modes of nutrition in plants and animals

  • Autotrophic nutrition
  • Heterotrophic nutrition

  
• Autotroph


  An organism that makes its own food from simple raw materials
• Photosynthesis


  1. Green plants synthesize food through this process

  2. Uses water, carbon dioxide and sunlight energy

  3. Produces glucose and oxygen

  
• The sugar produced is stored in the form of starch in plants
• Autotrophic plants are also known as producers
• Site of photosynthesis

  • Leaves are the most suitable organs
  • Contain chloroplasts which are the main sites of photosynthesis

  
• Small intestine


  A long tube-like organ that connects the stomach and the large intestine, about 20 feet long and folds many times to fit inside the abdomen
• Small intestine


  • Has three parts: the duodenum, jejunum, and ileum
  • Helps to further digest food coming from the stomach
  • Absorbs nutrients (vitamins, minerals, carbohydrates, fats, proteins) and water from food so they can be used by the body
  • Part of the digestive system

  
• As a person grows, the small intestine increases 20 times in length from about 200 cm in a newborn to almost 6 m in an adult
• The length of the small intestine is approximated by three times the length of the infant, or height of the child or adult
• Duodenum


  About 25 cm (10 inches) long
• Jejunum


  About 2.5 m (8 feet) long
• Ileum

  About 3.6 m (12 feet) long
• The small intestine is the part of the intestines where 90% of the digestion and absorption of food occurs, the other 10% taking place in the stomach and large intestine

  
• Main function of the small intestine

  Absorption of nutrients and minerals from food

  
• Nutrition


  The process of obtaining food required to obtain energy to carry out life processes

  
• Major modes of nutrition

  • Autotrophic nutrition
  • Heterotrophic nutrition

  
• Plants and animals do not obtain food by the same processes
• Plants and some bacteria have the green pigment chlorophyll to help synthesize food, while animals, fungi and other bacteria depend on other organisms for food
• Main modes of nutrition in plants and animals

  • Autotrophic nutrition
  • Heterotrophic nutrition

  
• Autotroph


  An organism that makes its own food from simple raw materials
• Photosynthesis


  1. Green plants synthesize food through this process

  2. Uses water, carbon dioxide and sunlight energy

  3. Produces glucose and oxygen

  
• The sugar produced is stored in the form of starch in plants
• Autotrophic plants are also known as producers
• Site of photosynthesis


  • Leaves are the most suitable organs
  • Contain chloroplasts which are the main sites of photosynthesis
• Requirements for photosynthesis

  • Chlorophyll
  • Carbon dioxide
  • Water
  • Sunlight

  
• Chlorophyll


  Green pigments found in all photosynthetic organisms, responsible for their green colour
• Carbon dioxide


  Plants obtain it through stomata on leaf surfaces

  
• Water


  Absorbed by roots and transported to leaves
• Sunlight


  Provides energy for splitting water molecules