Role Of Active - Transport !!top!!

Just outside the city’s walls—the cell membrane—lay the extracellular world. K+ had heard legends about it from a grizzled old sodium ion: “Out there, kid, the concentration of us potassium folk is low. Really low. You’d be special. You’d be needed.”

“You want out?” the gatekeeper rumbled. “You can’t drift. You can’t slide. The universe wants you in here. But the cell needs you out there.”

The gatekeeper opened its three inner pockets. “Then you must pay the price.”

K+ looked back one last time. “No,” he said. “It’s the only way to make a real difference.”

First, it reached inside the cell and grabbed three sodium ions, dragging them out against their chemical wishes. The sodium ions screamed—they hated the low-salt outside world—but the gatekeeper used one precious ATP to wrench them through.

But then he understood.

For a dizzying second, K+ floated in the extracellular space. The concentration of potassium here was indeed tiny. He was an outsider, a minority, a gradient waiting to happen.

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Just outside the city’s walls—the cell membrane—lay the extracellular world. K+ had heard legends about it from a grizzled old sodium ion: “Out there, kid, the concentration of us potassium folk is low. Really low. You’d be special. You’d be needed.” role of active transport

“You want out?” the gatekeeper rumbled. “You can’t drift. You can’t slide. The universe wants you in here. But the cell needs you out there.”

The gatekeeper opened its three inner pockets. “Then you must pay the price.” You’d be special

K+ looked back one last time. “No,” he said. “It’s the only way to make a real difference.”

First, it reached inside the cell and grabbed three sodium ions, dragging them out against their chemical wishes. The sodium ions screamed—they hated the low-salt outside world—but the gatekeeper used one precious ATP to wrench them through. You can’t slide

But then he understood.

For a dizzying second, K+ floated in the extracellular space. The concentration of potassium here was indeed tiny. He was an outsider, a minority, a gradient waiting to happen.