SYSTEMIC									PULMONARY
Serves many tissues									Serves one organ
Variable requirements									Single function
Many controls									Little (not no) controls
High pressure head									Low pressure head
High resistance									Low resistance
Long hydrostatic columns									Short hydrostatic columns
Larger blood volume									Smaller blood volume
Adrenergics more important									Adrenergics less important
Arteries hold less blood									Arteries hold more blood