“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.”
He looked back at the membrane and saw the —small, passive doors that let potassium trickle back into the cell when it wanted. And he realized: the gatekeeper’s exhausting, constant, active work—shoving three sodiums out, pulling two potassiums in—was the only reason those leak channels had any power. role of active transport
“Exactly,” said the gatekeeper. “I will carry you against the tide. Not because the tide is wrong, but because the cell’s life depends on this imbalance.” “You want out