Question

What sort of transporters would be required to move glucose from the blood to the lumen?

Answer 1

Because we can assume a modest concentration of Na+ in the lumen due to intestinal secretions ... Notice that ATP energy is not directly required for the transporters moving glucose.

Answer 2

Whether a cell uses facilitated diffusion or active transport depends on the specific needs of the cell. For example, the sugar glucose is transported by active transport from the gut into intestinal epithelial cells, but by facilitated diffusion across the membrane of red blood cells.

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