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- Sammy Sandwich is excited to be picked up and popped into a mouth! He is ingested. The teeth break down Sammy into smaller bits to be swallowed. Saliva lubricates the food. The enzyme in the saliva is called amylase and breaks down starch in the bread.
- Sammy Sandwich slides down the oesophagus into the stomach. A wave of contraction passes along the oesophagus pushing Sammy forward. The wave of contraction is called peristalsis.
- He enters the stomach and is irritated that he has to stay there for approximately four hours! The stomach helps to break down Sammy. Gastric juice is produced by glands in the walls. The juice is mostly hydrochloric acid which kills microorganisms in Sammy. Protease helps break down the protein in the ham and cheese.
- In the small intestine Sammy is broken down by more enzymes! Amylase breaks down starch in Betty Bread, lipase breaks down fats in Cho Cheese and protease breaks down protein in Cho Cheese and Harry Ham. The acid is neutralised by pancreatic juice and bile which come from the liver and pancreas. Most of Sammy's nutrients are absorbed into the blood.
- Sammy Sandwich is relieved to enter the large intestine. The large intestine absorbs most of the water from Sammy into the blood. Some bacteria in the large intestine can use the remains of Sammy Sandwich to make some vitamins the body needs.
- Finally the remains of Sammy Sandwich that have not been absorbed into the cells of the body reach the rectum. The rectum stores Sammy Sandwich safely before being egested from the body.
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