Catecholamine (Epinephrine)-blockersa. Somatosensory nervous systemb. Sympathetic nervous system

are often used as a treatment to dilate blood vessels and therefore decrease arterial blood pressure (as a treatment for hypertension). This fact is excellent evidence to prove that the nervous system normally controlling the diameter of the arterial blood vessels is the:

c)Reticular attenuating nervous system

d)Parasympathetic nervous system