Normal circulatory homeostasis depends upon there being a basal level of activity in both the sympathetic and parasympathetic nervous systems - the ANS is controlled by the cardioinhibitory and vasomotor centres within the medulla oblongata . The ANS is the most rapidly responding regulator of blood pressure. | Normal circulatory homeostasis depends upon there being a basal level of activity in both the sympathetic and parasympathetic nervous systems - the ANS is controlled by the cardioinhibitory and vasomotor centres within the medulla oblongata . The ANS is the most rapidly responding regulator of blood pressure. |