Amino acids are taken up by animal cells using a symport in...

Amino acids are taken up by animal cells using a symport in the plasma membrane. What is the most likely ion whose electrochemical gradient drives the import? Is ATP consumed in the process? If $s o,$ how?

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Key Concepts

Na+/K+ ATPase

The Na+/K+ ATPase is an integral membrane protein that uses ATP to export sodium ions and import potassium ions, thereby establishing and maintaining the sodium concentration gradient across the plasma membrane. This sustaining gradient is essential for the function of sodium-dependent symporters in secondary active transport.

Secondary Active Transport

This process is classified as secondary active transport because the movement of amino acids is directly coupled with the movement of sodium ions down their electrochemical gradient. Although ATP is not directly used by the symporter, the maintenance of the sodium gradient, which drives the transport, is achieved by the Na+/K+ ATPase, which consumes ATP.

Sodium Ion

Sodium ions (Na+) are the most likely candidate whose electrochemical gradient drives the import of amino acids in animal cells. The gradient is such that there is a higher concentration of sodium outside the cell than inside, which allows sodium to flow down its gradient, providing the necessary energy to co-transport amino acids into the cell.

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