The digestive system

• Food contains a lot of large insoluble molevules that cannot get into blood
• These need to be broken down into small soluble molecules such as glucose, which can pass into the blood and so be used in cells

• Food is broken down in a process called digestion, which takes place in organ ststem called the digestive system
• The digestive system is mad up of the alimentary canal, a muscular tube running through the body from mouth to anus, and several other organs that make chemicals needed for digestion (such as enzymes)

1. Mouth

• Where food is taken into the body
• During chewing, teeth  break up the fod into small pieces
• This increases the surface area for digestive enzymes to work on
• The tongue helps to form the chewwed food into a ball called a bolus
• The bolus gets coated in saliva which lubricates it and makes it easier to swalow
• Saliva also contains an enzyme that starts to break down the starch…