This document describes cardiovascular physiology concepts including hemodynamics diagrams. It summarizes: 1) The vascular function diagram shows that venous return is driven by the pressure difference between mean systemic filling pressure and right atrial pressure, divided by resistance to venous return. 2) The cardiac function diagram depicts Starling's law of the heart, where cardiac output depends on right atrial pressure based on the heart's Frank-Starling mechanism. 3) The vascular and cardiac function curves intersect at a single point where venous return and cardiac output are equal. The cardiovascular system adjusts to maintain this equilibrium point.