Glucose is absorbed from the small intestine into the blood
- A. only by simple diffusion, so absorption stops when concentrations are equal
- B. by osmosis through the capillary wall
- C. by active transport, so it can be taken up even against a concentration gradient
- D. through the lacteals along with fats
Explanation
Absorption must continue until almost all the glucose is recovered, and that means moving it out of the gut even when the concentration there has fallen below that in the blood, which requires energy from ATP. This is why the epithelial cells of the villi are rich in mitochondria. Osmosis applies to water alone, and the lacteals absorb the products of fat digestion rather than sugars.
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