[Solved] Glands that have no ducts,but release their products directly into tissue fluid and blood,are called: A) endocrine. B) exocrine. C) holocrine. D) apocrine. Psychosexual Stages: A series of developmental stages children pass through, according to Freud, in which pleasure focuses on a distinct erogenous zone, influencing personality development. Freud's Theory: A set of psychoanalytic theories developed by Sigmund Freud that focus on unconscious motives and conflicts, particularly those originating in childhood. Phallic Stage: The phallic stage is a concept in Freudian psychology referring to the period in early childhood when the libido (sexual energy) is concentrated in the genital area. Erotic Desires: Feelings of wanting or longing for sexual contact or relationships.