Encyclopedia Britannica Illustrated Science Library 2009 – Human Body I

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Encyclopedia Britannica Illustrated
Science Library 2009 – Human Body I
Edition 2009
pages 56

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Encyclopedia Britannica Illustrated
Science Library 2009 – Human Body I

?How can we understand what we are
What are we made of? Are we aware that all that we do including reading
this book is the work of a marvelous machine? We know very little about how we
are able to be conscious of our own actions; nevertheless, even though we are usually not
very aware of it, this community of organs that is the body an integrated system that
includes the brain, heart, lungs, liver, kidneys,muscles, bones, skin, and endocrine glands
acts together in exquisitely regulated harmony. It is interesting that various
;mechanisms work together to keep the temperature of the body at 98.6° F -37° C
thanks to the dynamic structure of bones and cartilage, the body is maintained in
perfect balance. The body also has a fantastic ability to transform the food it
.ingests into living tissues, bones, and teeth, all of which contribute to its growth
By this same process, we obtain the energy for working and playing. It is hard to
imagine that not long ago the cells of the body of the person reading this book were
autonomous and were duplicating themselves freely within the walls of a
mother’s uterus. Certainly no one reading this book could recognize herself
or himself in those cells. Nevertheless, each cell carried within it the information
necessary for the development of that person. Everything that happens inside us is
truly fascinating. Therefore, we invite you to enjoy this book. It is full of incredible facts
.and illustrations that will show you the complex ways each part of the body works
What are cells like, and how do they form tissue? What is blood, and why are proteins
so important? The heart, usually thought of as the wellspring of love and the emotions, is
.actually the engine of the circulatory system
It is because of the heart that all the cells of the body receive a constant supply of
nutrients, oxygen, and other essential substances. The heart is so powerful that it
pumps about 10 pints (4.7 l) of blood per minute. The nervous system is the most
.intricate of all the body’s systems