Which components comprise the Perfusion Triangle?

• A. Heart, Lungs, Brain
• B. Heart (pump), vessels (container), blood (content)
• C. Arterial, venous, capillary circulation
• D. Liver, heart, kidneys

Answer: (B)

Perfusion depends on three interacting elements: the pump, the container, and the content. The heart provides the pumping force that drives blood through the circulation. The vessels act as the container, offering pathways and resistance that determine how easily blood flows and how it is distributed. The blood itself is the content, supplying the volume and the oxygen and nutrients needed by tissues. If any one of these is insufficient—cardiac output falls, vascular volume is too low or vessels lose tone, or blood volume is reduced—tissue perfusion drops. The other options don’t capture this fundamental trio: lungs and brain relate to oxygenation and control but aren’t the three-part framework; arterial/venous/capillary describe parts of circulation rather than the supplying framework; and other organs listed aren’t the components of this model.