Final answer:
Psychoneuroendocrinology is the term for the study of the interactions between the psychological, neurological, and endocrine systems.
Step-by-step explanation:
The term for the study of the interactions between the psychological, neurological, and endocrine systems is Psychoneuroendocrinology. This field of study focuses on how these systems interact and affect each other. For example, cortisol is a hormone produced by the endocrine system that can have an impact on mood and stress levels, which in turn can affect the neurological and psychological aspects of a person.