Chapter 12: Neuropeptides within the nucleus tractus solitarii modulate the central cardiovascular control process
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Local administration of small amounts of vasopressin, angiotensin or endothelin into the nucleus tractus solitarii elicits similar decreases in blood pressure and heart rate. These central effects oppose the peripheral action of these hormones on the cardiovascular system. The baroreceptor-heart-reflex, however, is influenced differentially: vasopressin and angiotensin II enhances the sensitivity of the reflex but angiotensin III impairs it. In this way the cardiovascular system may be adjusted to different demands including those related to electrolyte and fluid homeostasis.

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