Final answer:
Micelles are tiny spheres formed by bile salts and lecithin that enclose long-chain fatty acids and monoacylglycerides. They play a crucial role in lipid absorption by facilitating the transport and contact of lipids with the absorptive surfaces of the epithelial cells in the small intestine.
Step-by-step explanation:
Micelles are tiny spheres formed by bile salts and lecithin that enclose long-chain fatty acids and monoacylglycerides. These micelles help in the absorption of lipids by facilitating their transport to the absorptive surfaces of the epithelial cells in the small intestine. Without micelles, lipids would not come in contact with the absorptive surfaces and would remain on the surface of the chyme.