A discussion of what constituted the psychological definition and meaning of "mood" started the class. How mood was an emotional state in contrast to an emotion, feeling, or affect. How a mood can be changed by an unexpected event, from the happiness of seeing an old friend to the anger of discovering betrayal by that friend. The class diverted to emotional health due to mood changes, and for the remainder of the class, a discussion of growth hormone (somatatropin) , genetic and environmental affects on bone and connective tissue growth, and the effects of overproduction of HGH in adult life.