Amino Acids That Centrally Influence Blood Pressure and Regional Blood Flow in Conscious Rats

Figure 3

Tonic activities of vascular sympathetic nerves at various levels allow for regulation of flow rate. Basal tone at rest increased by sympathetic nervous activation produces vasoconstriction and a decrease in blood flow rate (an increase in resistance). When basal tone is inactivated, vasodilatation, an increase in flow rate (a decrease in resistance), is produced.