Suggests that the stainable material is AVP, which is released from granules in response to dehydration. Hormones are synthesized in cell bodies of hypothalamic neurons and transported down axons to the neurohypophysis. Packaged into secretory granules. Remain loosely bound. Stored in axon terminal.
Secretion is stimulated by an action potential.
Hormone and neurophysin are secreted together. Review of function of nephron. Reabsorption of various substances from tubule. Other substances are added by secretion. Concentration gradient of renal extracellular fluid is established by loop of Henle.