Human nutrition, transport and gas exchange – Biology notes (Cambridge O Level)

Balanced diet; deficiency diseases (scurvy, rickets, kwashiorkor); the alimentary canal; mechanical and chemical digestion; enzymes (amylase, protease, lipase); bile emulsifies fats; hydrochloric acid kills microbes and gives the optimum pH for pepsin; absorption in the small intestine via villi; water absorption in the colon.