The Digestive System

The Digestive System

1. Consists of

   • Organs off the digestive tract
     • Liver
       • The largest internal organ and produces bile which acts in a similar way to dishwashing liquid by breaking down fats and oils.
     • Pancreas
       • It is not part of the digestive tract but produces pancreatic juices that break down carbohydrates, fats and proteins.
   • Digestive tract
     • Oesophagus
       • Is a long muscular tube that has the mouth at one end and the stomach at the other end.
     • Stomach
       • Food is stored in the stomach for 1-6 hours and is moved around mechanically and is mixed with gastric juice.
     • Duodenum
       • Duodenum have a muscular walls that continue to squeeze and churn the food , breaking it down and making sure that the digestive chemicals are mixed through.
     • Small intestine
       • It is a very long tube up to 6 metres long and here the digested food is absorbed into the body
     • Mouth
       • Biting and chewing is a form of mechanical digestion, but chemical digestion also takes place in the mouth as the food is mixed with saliva.
     • Large intestine
       • Is the part of the digestive system in which the food you eat are processed into faeces.It is wide and that is where it got its name from.

2. Digestion

   • Mechanical
     • Happens when you tear and chew food with your teeth
   • Chemical
     • Happens when saliva in your mouth and gastric juice in your stomach break down food

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