Cells are the fundamental building blocks of living tissues.
It is merely the fluid in which it floats that degenerates. A famous French physiologist, Alexia Carrell, kept a chicken heart alive for about twenty-eight years. He incubated a chicken egg. The heart of the developing young chick was taken out and cut in pieces. These pieces, consisting of many cells, were transferred into a saline solution which contained minerals in the same proportion as chicken blood.