The energy is essential, as cells need it to do work.

Which our cells need in order for us to live.

After all, the cells in the computer simulations don't need to breathe.

Every cell in the body needs it to survive.

Your cells need cholesterol, and your body makes all it needs.

But every cell in my body needed and wanted to be a mother.

Your cells need supplies of glucose from the blood in order to keep going.

Your body's cells need cholesterol to function properly, but too much in the blood causes problems.

The cell needs metabolic energy for each action potential it produces.

The receptor has a job of its own, and the cell needs it.