2007-03-19 23:58:26 · 3 answers · asked by abey t 1 in Science & Mathematics ➔ Engineering
What is your question ?
2007-03-20 00:08:18 · answer #1 · answered by Gene 7 · 0⤊ 0⤋
The word 'signal' was derived from Latin signale.
Signal means detectable physical quantity or impulse
(as a voltage, current, or magnetic field strength) by
which information can be transmitted.
http://www.m-w.com/dictionary/signal
Cells continuously receive information ('signals') from
their environment and from their neighbours. These
signals are converted into intracellular 'second
messenger signals' which ultimately make the cells
respond by, for example, dividing, moving or even
dying. Deregulated signalling is a hallmark of cancer
cells.
http://www.ludwig.ucl.ac.uk/cellsig_html/index.htm
The word 'system' was derived from Greek 'systEma' (to
combine).
http://www.m-w.com/dictionary/system
A system is a unit which combines many elements that
are capable of sending or receiving signals.
Each neuron in the brain is capable of sending or
receiving signal. The brain as unit can be called a
neural system. Each area of the brain connected with a
sense can be called a sub-neural system.
http://senselab.med.yale.edu/senselab/
2007-03-20 07:34:32 · answer #2 · answered by Anonymous · 0⤊ 0⤋
from an engineering standpoint:
signal - something that conveys information
system - something that alters, conditions, or manipulates a signal
are you referring to the book by oppenheimer and oppenheimer?
2007-03-20 18:53:23 · answer #3 · answered by dylan k 3 · 0⤊ 0⤋