• The ileum is long and lined with millions of villi (plural)
• Villi have microvilli to further increase internal surface area of the small intestine
• The wall of the villus (singular) is only one cell thick so diffusion and active transport is easier
• A network of blood capillaries transports amino acids and sugar molecules in the blood
• Lacteals (lymph capillaries) transport fatty acids and glycerol in the lymph

Diagram of a lacteal is on the way 🙂