Jamie’s eyes widened. That was the gradient. The concentration was higher outside. The molecule wanted to stay out. But the cell needed it in.
And in that instant, the pump changed shape. It yawned open on the outside, scooped up a reluctant sodium ion, and then—with a visible, muscular heave —wrenched it through the membrane and spat it out on the inside. explanation of active transport
But the phone was dead. The phone needed sodium. Not outside the glass. Inside . The phone was the cell’s mitochondria, screaming for fuel. The sodium had to get into the glass, against its natural drift. Jamie’s eyes widened