vital organ
vitals

All vital organs begin to lose some function as you age.

He couldn't remember any vital organs being in that area.

The second step would have been to remove the vital organs.

It is no small thing to offer up a vital organ.

The point hit bone, was turned away from vital organs.

Then he looked around and all the vital organs in his body seemed to fall away, leaving him hollow.

The liver is a large vital organ present in all fish.

Most of your baby's vital organs are formed and in place.

The journal became a vital organ of the growing movement.

A long time ago failure of a vital organ meant death.