Re: Prof Emerson on the naked cell

On Tue, 18 Sep 2007 12:16:17 -0700, backspace
<sawireless2000@xxxxxxxxx> wrote:

http://www.time.com/time/magazine/article/0,9171,773029,00.html 12
Jan 1942 Time magazine

Professor Emerson
"The naked cell lived in less optimal conditions than did the cell in
a group. Through division of labor and coordination between cells, the
external environment of the single-celled organism became the internal
environment of the multicellular organism."

What was Emerson talking about?

The idea was first proposed by Claude Bernard some 150 years ago: "the
fixity of the internal environment is the condition for free life"
(except Bernard, being French, called it "milieu interieur").

The major point is that multicellular organisms, especially
multicellular animals, produce an internal fluid environment which is
carefully regulated to maintain constant conditions suited for life.
The ionic and osmotic composition and pH is controlled as are the
concentrations of important nutrients and wastes. All the cells of
the organism live in this internal environment whereas the organism,
itself, lives in the much more hostile external environment. None of
our own cells can live in the environment we ourselves inhabit: just
about all the cells that contact that external environment are dead.

.

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