That was it. That was the whole secret.
Here are three different options for a draft post about active transport, depending on your target audience and platform. explanation of active transport
Jamie looked at the water glass, then at the phone. For the first time, the world didn't feel like a slide into stillness. It felt like a million tiny, defiant pumps working in the dark, spending everything they had to keep the impossible thing— life —running uphill. That was it
The bell shrieked. Jamie grabbed a skateboard and fled, the fluorescent lights of the hallway buzzing like trapped flies. Jamie looked at the water glass, then at the phone
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.
Even if a cell has more glucose inside than the fluid outside, it still wants to grab every bit of sugar it can for energy.