| A | B |
|---|
| mouth | contains teeth and tongue |
| teeth | cut, crush and grind food |
| saliva | makes food slippery |
| amylase | enzyme in saliva which breaks down starch |
| stomach wall muscles | churn the food |
| hydrochloric acid | breaks proteins to peptides, kills germs |
| pepsin | enzyme catalysing digestion of proteins |
| small intestine | site of digestion of proteins, starch and fats |
| small intestine wall | allows absorption of simple molecules into the blood |
| lipase | enzyme catalysing fat digestion |
| large intestine | water is absorbed in this ection |
| rectum | undigested food collects here as faeces |
