Programmed Cell Death
Programmed cell-death (or PCD) is death of a cell in any form, mediated by an intracellular program. PCD is carried out in a regulated process, which usually confers advantage during an organism's life-cycle. PCD serves fundamental functions during both plant and metazoa (multicellular animals) tissue development. Apoptosis and autophagy are both forms of programmed cell death, however necrosis is a non-physiological process that occurs as a result of infection or injury.
Necrosis is the death of a cell caused by external factors such as trauma or infection and occurs in several different forms, not a form of PCD as previously stated.
Read more about Programmed Cell Death: Types, Other Types, Atrophic Factors, History, Programmed Cell-death in Plant Tissue, Programmed Cell Death in Slime Molds, Evolutionary Origin of PCD
Famous quotes containing the words programmed, cell and/or death:
“Ideally, advertising aims at the goal of a programmed harmony among all human impulses and aspirations and endeavors. Using handicraft methods, it stretches out toward the ultimate electronic goal of a collective consciousness.”
—Marshall McLuhan (1911–1980)
“Let man consider what he is in comparison with all existence; let him regard himself as lost in this remote corner of nature; and from the little cell in which he finds himself lodged, I mean the universe, let him estimate at their true value the earth, kingdoms, cities, and himself. What is a man in the infinite?”
—Blaise Pascal (1623–1662)
“The child who enters life comes not with knowledge or intent,
So those who enter death must go as little children sent.
Nothing is known. But I believe that God is overhead;
And as life is to the living, so death is to the dead.”
—Mary Mapes Dodge (1831–1905)