Digestion

• digestion


  where large molecules are broken down into smaller soluble molecules so they ca be absorbed into the blood.
• mechanical breakdown


  The process of physically chewing the food when the teeth chew it
• enzymes break down large insoluble foods into small and soluble

  . they are now small enough to pass through the small intestine(villi). This happens by diffusion
• Enzymes break down large insoluble foods


  1. Into small and soluble

  2. They are now small enough to pass through the small intestine(villi)
• The area of high concentration of small and soluble food is in the small intestine


  The area of low concentration will be in the blood stream
• Small food particles will diffuse


  Into the bloodstream
• adaptations of the villi founded in the small intestine

  -The walls of the villi are thin which provides short diffusion for small food particles to be absorbed

  -The villi are small but numerous providing a large surface area to absorb small food molecules

  -They have a good blood supply so that continual food diffusion takes place
• oesophagus-Tube where food travels down to the stomach. Peristalsis starts here.
• peristalsis


  a series of wave-like muscle contractions that move food through the digestive tract.
• mouth


  contains teeth to chew and manually brak down food
• salivary glands


  produces saliva which contains enzymes
• stomach


  churns food, makes hydrochloric acid
• liver


  makes bile
• pancreas


  produces all enzymes
• gall bladder


  stores bile
• small intestine


  where small food molecules are absorbed into the blood
• large intestine


  where water is absorbed
• rectum


  feces is stored here before being released out the body
• anus


  feces is released out the body