Digestive system

• What is a tissue ?

  a group of cells with a similar structure and function
• What is an organ ?

  a group of tissues working together for a specific functions
• What is an example of an organ ?

  stomach contains muscle tissue and glandular tissues
• What is organ system ?

  groups of organs which work together to form organisms
• What is an example of an organ system ?

  Digestive system
• What three main nutrients are in food ?

  carbohydrates,protein and lipids (fats)
• Carbohydrates,protein and lipids are large molecules that cant be absorbed into the blood stream so they have to be digested
• What happens during digestion ?

  large food molecules are broken into small molecules by enzymes so that they can be absorbed into the blood stream
• What is the function of the mouth ?


  food is chewed and enzymes in the saliva begin to digest the starch into small sugar molecules
• What is the function of the oesophagus?

  food is passed down the oesophagus into the stomach
• What is the function of the stomach ?

  the enzymes begin the digestion of proteins .There is hydrochloric acid which helps enzymes digest proteins
• The food stays in the stomach for hours
• The churning action of the stomach muscles turns the food into fluids increasing the surface area for enzymes to digest
• What happens after the stomach ?

  the food is passed to the small intestine
• The small intestine release chemicals into the liver and the pancreas
• Whats the main function of the small intestine ?

  absorbs nutrients more quickly
• What is the main function of the pancreas ?

  the liver releases bile which helps speed up the process of digestion of lipids
• What is bile ?

  neutralises the acids released from the stomach
• What is the main function of the large intestine ?

  water is absorbed into the blood stream
• What is the main function of the rectrum?

  faeces is then released
• What is the purpose of the digestive system ?

  large food molecules are digested into smaller molecules then the products are then absorbed into the blood stream
• What happens to the products of the digestion ?

  they are used to build new carbohydrates,lipids,and protein