Even though the blood glucose concentration may drop below the intracellular glu

Question

Even though the blood glucose concentration may drop below the intracellular glucose concentration - for example, during a long fast - brain cells can still absorb glucose from the bloodstream. Under these circumstances, how does glucose get into the cells? A. Simple diffusion B. Facilitated diffusion C. Direct active transport D. Indirect active transport E. It doesn’t Even though the blood glucose concentration may drop below the intracellular glucose concentration - for example, during a long fast - brain cells can still absorb glucose from the bloodstream. Under these circumstances, how does glucose get into the cells? A. Simple diffusion B. Facilitated diffusion C. Direct active transport D. Indirect active transport E. It doesn’t A. Simple diffusion B. Facilitated diffusion C. Direct active transport D. Indirect active transport E. It doesn’t

Explanation / Answer

B. Facilitated diffusion

facilitated diffusion, a form of carrier-mediated endocytosis, in which solute molecules bind to specific membrane protein carriers, also from high to low concentration.

In response to fasting, the endothelial cells will create more glucose transporters: 25 percent more. Half of those new transporters are seen to be assigned to the luminal side of the membrane (blood-brain barrier) to help transport as much glucose as possible from the blood.

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