LABORATORY REVIEW
DIFFUSION AND OSMOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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by active transport against the concentration gradient
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by active transport down the concentration gradient
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by diffusion against the concentration gradient
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by diffusion down the concentration gradient
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Detailed explanation-1: -Glucose absorption takes place in small intestinal villus cells by SGLT1, which is driven by active sodium extrusion via the basolateral Na+/K+ ATPase.
Detailed explanation-2: -Active transport of glucose mediated by SGLT1 in the apical membrane of enterocytes appears as the main molecular mechanism of glucose absorption in the small intestine. This mechanism determines the rate of glucose entry into the bloodstream under both low and high carbohydrate load in the gut.
Detailed explanation-3: -The absorption of more glucose than the body can use or store as glycogen leads to the deposition of fat. However, there is evidence that even when the absorbed glucose is not in excess of immediate requirements a large proportion is converted into fat which is then utilised.
Detailed explanation-4: -So, the glucose moves from high concentration in the small intestine to lower concentration in the blood by diffusion.