Human Biology: The Roots of Consciousness (Link)

The Biological Perspective
In the Introduction, I discussed the evolution of organized matter from the photon through particles, atoms and molecules to living cells which begin to differentiate in structure and function forming a wide variety of tissues and organs that play a specialized function in the human body. It is reasonable to assume all these levels of organization including the whole human being play a role in shaping consciousness. Particularly important are the nervous system, comprising brain and spinal cord, and the endocrine system, comprising a number of ductless glands that secrete hormones into the bloodstream. Many biological scientists today implicitly believe that these structures not only shape consciousness, but are actually the source of conscious awareness. This view is known as the biological identity theory.


Read the entire story here: http://www.williamjames.com/Theory/BIOLOGY.htm