Abstract
H ORMONE ACTION IS AN AREA of physiology that presents a challenge to instructors seeking economical procedures for demonstrating principles. The milk-ejecting activity of the neurohormone, oxytocin, on mammary gland tissue is a dynamic example of the mechanism of action of a hormone, yet it is simple and relatively inexpensive to demonstrate. The main physiological role of oxytocin, a hormone of the posterior pituitary gland of mammals (Linzell 1959), is to stimulate milk release from the mammary gland. Oxytocin is an example of a neurohormone because it is synthesized within neurons in the hypothalamus, an area of the lower part of the brain (diencephalon) responsible for the control of many physiological functions. Oxytocin is transported within these neurosecretory neurons to their neural endings in the posterior pituitary gland. The
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