Which of the following transport processes is inhibited by decreasing the usual Na+ gradient across the cell membrane in transport of glucose from the intestinal lumen into a small intestinalSelect one:a. Co- transportb. Facilitated diffusionc. Simple diffusiond. Primary active transport
Question
Which of the following transport processes is inhibited by decreasing the usual Na+ gradient across the cell membrane in transport of glucose from the intestinal lumen into a small intestinalSelect one:a. Co- transportb. Facilitated diffusionc. Simple diffusiond. Primary active transport
Solution
The transport process that is inhibited by decreasing the usual Na+ gradient across the cell membrane in transport of glucose from the intestinal lumen into a small intestinal cell is Co-transport.
Here's why:
Co-transport, also known as secondary active transport, involves the movement of two or more substances across a membrane in the same direction. In the case of glucose transport from the intestinal lumen into a small intestinal cell, glucose is co-transported with sodium ions (Na+).
This process relies on the Na+ gradient across the cell membrane, which is maintained by the primary active transport of Na+ out of the cell. When the Na+ gradient decreases, the energy driving the co-transport of glucose and Na+ into the cell also decreases, thus inhibiting the co-transport process.
Therefore, the correct answer is a. Co- transport.
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