According to Poiseuille's Law, pressure equals flow multiplied by what?

Poiseuille's Law describes the relationship between pressure, flow rate, viscosity, and resistance in a fluid system, particularly in the context of cylindrical vessels such as blood vessels. The law mathematically expresses that the pressure drop across a length of a vessel is directly proportional to the flow rate and the resistance of the fluid in that vessel.

The correct answer, which indicates that pressure equals flow multiplied by resistance, highlights this principle: as flow increases, pressure must also increase if resistance remains constant. This is a crucial concept in hemodynamics and perfusion science, as it helps professionals understand how changes in flow or resistance can impact overall system pressure.

Viscosity, though an important factor in the law, relates to the internal friction of liquid flow rather than being a direct parameter for calculating pressure in this context. Therefore, recognizing resistance as the correct relationship allows for a clearer understanding of the mechanics of fluid movement within cardiovascular systems.