BChanges in blood volume or venous compliance change the venous return curve

(1) Increases in blood volume or decreases in venous compliance increase mean systemic pressure, shifting the venous return curve to the right in a parallel fashion (Figure 3-13). A new equilibrium, or intersection, point is established at which both cardiac output and right atrial pressure are increased.

(2) Decreases in blood volume (e.g., hemorrhage; not illustrated) or increases in venous compliance have the opposite effect— decreased mean systemic pressure and a shift of the venous return curve to the left in a parallel fashion. A new equilibrium point is established at which both cardiac output and right atrial pressure are decreased.

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