Now, normally, if we ingest the lactose, eventually it makes its way into the small intestine of our body. And once inside our intestines, a special type of digestive enzyme is released, known as lactase. And what lactase does is it's able to actually use water molecules to catalytically cleave this glycocitic bond. And so he formed these two individual monosaccharides sugar molecules, so the glucose and the galactose. And once we form these monosaccharides in the lumen of our small intestine, only then can the cells actually uptake these individual monosaccharides into their cytoplasm. Before that, in this stage, they can't actually uptake this relatively large molecule due to its size.