Chapter 3 (Biological Psychology) is an extremely complex chapter. It brigdes the levels of analysis between all of the different function of your brain and body. The introduction of stem cells, nerve cells, the central nervous system, the endocrine system and more cause this chapter to be extremely intriguing. Ancient people often assumed that the heart was the "center" of the body due to the fact that it speeds up when certain emotions or physical strains are occurring in the body. The brain, however, is the center of feeling, thoughts, and emotion. It is known as the most complicated structure in the known universe for a reason. In this video "The Miracle in Human Brain" Susan McConnell shows how our three pound brain can accomplish the astonishing feats that is does.
Another interesting topic that this chapter touched on was the Nature vs. Nurture concept. Through the twin studies scientists were able to prove that identical twins are more alike on a psychological characteristic, such as intelligence or athletic ability, than fraternal twins are. Chapter 3 was filled with information critical to understanding the way our body functions which is crucial in determining why we do what we do.