Final answer:
The interventricular septum and papillary muscles are two components of the ventricles, with the left ventricle acting as a high-pressure system in the heart.
Step-by-step explanation:
Two components of the ventricles in the heart are the interventricular septum, which separates the left and right ventricles, and the papillary muscles, which anchor the chordae tendineae that are attached to the heart valves to prevent them from inverting.
The ventricle that serves as a high-pressure system is the left ventricle. During ventricular systole, the left ventricle pumps blood into the aorta and throughout the systemic circulation with significant pressure to overcome the resistance of the entire systemic vasculature.