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Digestion

A summary of the main sections of the alimentary canal, along with their functions and associated chemicals.

Tools

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