The specialized features of the small intestine that enable efficient absorption of digested food include villi and microvilli. The villi are finger-like projections lining the ileum that are richly supplied with blood capillaries and lacteals. The microvilli further increase the absorptive surface area. Sugars, amino acids, and fatty acids are absorbed into the bloodstream or lacteals by diffusion or active transport. Fats are recombined into lipoproteins within the villi and transported to the bloodstream.