Biosociology is an emerging paradigm seeking to understand human behavior by integrating relevant insights from the natural sciences into traditional sociological thinking. Biosociology posits no ultimate causes of human behavior, rather it seeks to understand how biological factors interact with other factors to produce observed behavior. The book presents a brief introduction to biophysical systems that are important to the understanding of human behavior - genetics, neurophysiology, and the autonomic and endocrine systems. These systems are explored in the contexts of sociological importance, such as socialization, learning, gender roles, gender differences, sexuality, the family, deviance, and criminality.