DIAGRAM: GASTROINTESTINAL: GI: ARTERY: Effects of Hypertension on the Vessel Wall - 3 of 14; A=Intima, B=Media, C=Adventitia, D=Smooth Muscle Cell, E=Connective Tissue -- The exact stimuli for the growth of smooth muscle cells in the hypertensive vessel are not known with certainty, but in vitro studies have suggested some possibi