BitWithBite
Biology · Quick Reference
Lesson 10 — Digestive System Cheat Sheet
In one line: Four enzymes, four jobs — amylase, pepsin, lipase, and lactase each break down one specific substrate at one specific location.
Pathway
1Mouth → Oesophagus → Stomach
2Stomach → Small Intestine (ileum)
3Small Intestine → Large Intestine → Rectum → Anus
4Villi/microvilli in the small intestine maximise absorption surface area.
Enzyme → Substrate → Product
Amylase (mouth)
Starch → Maltose
Pepsin (stomach, pH 2)
Protein → Peptides
Lipase (S. intestine)
Fats → Fatty acids + glycerol
Lactase (S. intestine)
Lactose → Glucose + galactose