What is required to move blood in the model, according to the description?

What is required to move blood in the model, according to the description?

• A. A pressure difference between the pump and the beaker
• B. Equal pressures between the pump and the beaker
• C. A high flow rate through the left tube
• D. Constant beaker pressure

Answer: (A)

Blood in the model moves when there is a pressure difference between the pump side and the downstream beaker. The pump creates a higher pressure on the upstream side, pushing fluid toward the beaker where the pressure is lower. If the pressures are equal, there’s no driving force and no net flow regardless of other factors. A large pressure difference can yield a higher flow rate, but that rate is determined by how big the gradient is and the system’s resistance, not by the beaker’s pressure alone. Constant beaker pressure by itself doesn’t produce flow because it removes the driving force unless the pump creates a higher upstream pressure.

Blood in the model moves when there is a pressure difference between the pump side and the downstream beaker. The pump creates a higher pressure on the upstream side, pushing fluid toward the beaker where the pressure is lower. If the pressures are equal, there’s no driving force and no net flow regardless of other factors. A large pressure difference can yield a higher flow rate, but that rate is determined by how big the gradient is and the system’s resistance, not by the beaker’s pressure alone. Constant beaker pressure by itself doesn’t produce flow because it removes the driving force unless the pump creates a higher upstream pressure.