Which term describes the process of passing fluid through the circulatory system to an organ or tissue?

Perfusion refers to the flow of blood or fluid through the circulatory system, specifically to organs and tissues. This process is critical for delivering oxygen, nutrients, and hormones necessary for cellular function while also facilitating the removal of waste products. Adequate perfusion indicates that there is an appropriate supply of blood to meet the metabolic demands of tissues, ensuring their health and function.

In contrast, diffusion and osmosis are related to the movement of molecules across membranes. Diffusion refers to the passive movement of particles from an area of higher concentration to an area of lower concentration, while osmosis specifically deals with the movement of water across a semipermeable membrane in response to solute concentration differences. Transfusion, on the other hand, involves the transfer of blood or blood components from one individual to another, rather than the natural process of blood flow to tissues and organs. This distinguishes perfusion as the most fitting term for the question regarding fluid movement through the circulatory system.