Digestion

• Nutrients 


  Chemical components of food used by the body

  eg= fats, proteins, vitamins, carbohydrates
• Where is food digested?

  Mouth/stomach/small intestine
• how many salivary glands are there?

  3 pairs
• what does saliva contain?and why

  water-for moisture/mucus-lubricate /amylase-digest starch
• saliva+chewed food ?


  Bolus
• how is the food transported to the stomach?

  DOWN THE OESOPHEGUS THOUGH PERISTALSIS (MUSCLE CONTRACTIONS)
• Churning of food=


  Chyme
• what are the enzymes in the stomach? and what do they do?

  protease/pepsin.they break down protine
• what are proteins molecules broken to

  polypeptides and dipeptides
• what acid does the stomach have /what does it do?

  hydrochloric acid /kills bacteria maximize enzyme activity
• what special adaption does the stomach have and why?

  mucus lineing it to prevent auto digestion by proteas.
• bile:?made?stored?for?where?


  Bile is a alkaline substance made by the liver stored in the gal bladder.to emulsify fats.works in the duodenum.
• In the duodenum what are fat molecules broken to?

  Glycerol+fatty acids
• What is digestion?


  The breaking down of large insoluble molecules into small soluble molecules
• what is egestion (deflection)

  the removal of undigested or unresolved food as faeces(waste) though the anus
• absorption ?


  the movement of small food particles though the wall of the small intestine into the blood.