hlm. 92-101 ; 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 litle about how we ar 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 its interesting that various mechanisms work together to keep the temperature of the body at 98.6 F (37C)