ABSTRACT
This chapter reviews the chief features of neuromuscular and endocrine systems. It examines some of the dynamic relations of the organism to its environment—relations in which neural and endocrine processes play important parts. The effects of the endocrines upon personality must be considered in relation to other constitutional factors. The effects of the endocrines upon personality are chiefly indirect, the glands operating as they do through the whole constitutional system. The pancreas produces important chemical aids to digestion. But its classification as an endocrine gland arises from the fact that the islets of Langerhans, which lie embedded within the pancreatic tissue, give off a hormone known commercially and medically as insulin. There is much nonsense about the manner in which hormones directly affect behavior. The former make up in large part the tissues of the organs of digestion, respiration, elimination, sex, and glandular action.
