Final answer:
When the products of digestion are absorbed across the ileum epithelium into the bloodstream, their concentration in the lumen of the intestine decreases, facilitating the further movement of nutrients. For example, glucose is transported from the lumen into the epithelial cells and then into the bloodstream.
Step-by-step explanation:
The products of digestion are absorbed across the ileum epithelium into the bloodstream. When the products of digestion are absorbed across the ileum epithelium into the bloodstream, their concentration in the lumen of the intestine decreases, facilitating the further movement of nutrients. For example, glucose is transported from the lumen into the epithelial cells and then into the bloodstream.
Absorption of these products into cells lowers their concentration in the lumen of the intestine, allowing for the maintenance of concentration gradients that facilitate the further movement of nutrients from the lumen into the bloodstream.
For example, glucose is transported from the lumen of the intestine into the epithelial cells of the ileum, where it is further transported into the bloodstream. This lowers the concentration of glucose in the lumen and allows for the continual absorption of glucose.