When a nutrient moves, with the help of a carrier, from an area of higher nutrient concentration into an absorptive cell where the concentration of that nutrientis lower, this is called

Question

BlackTom AI · Accepted Answer

The question describes a nutrient moving from a higher concentration to a lower concentration into an absorptive cell with the help of a carrier protein. This aligns with facilitated diffusion, where a carrier protein enables specific molecules to cross the cell membrane down their concentration gradient without energy expenditure.

Option by option:
- phagocytosis: This is a bulk-uptake process where cells engulf large particles or cells into phagosomes. It is not the typical mechanism for small nutrient molecules crossing an intestinal epithelial cell, so this choice is incorrect.
- active absorption: This term refers to transport that requires energy (usually ATP) to move substances against their concentration gradient. The scenario specifies movement along the gradient (from high to low concentration) and with a carrier but without energy input, making this option incorrect.
- facilitated diffusion: Correct. It describes carrier-assisted transport down the concentration gradient, fitting the description exactly.
- passive diffusion: While this also moves substances down their gradient, it does so without a carrier protein. Since the question specifies the involvement of a carrier, passive diffusion is not the appropriate description here.

When a nutrient moves, with the help of a carrier, from an area of higher nutrient concentration into an absorptive cell where the concentration of that nutrientis lower, this is called单项选择题

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When a nutrient moves, with the help of a carrier, from an area of higher nutrient concentration into an absorptive cell where the concentration of that nutrientis lower, this is called

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