What happened when the pump pressure and the beaker pressure were the same?

What happened when the pump pressure and the beaker pressure were the same?

• A. No blood flow occurred because a difference in pressures is required to move the blood.
• B. Blood flow increased.
• C. Blood flow decreased but did not stop.
• D. Flow became turbulent.

Answer: (A)

Flow is driven by a pressure difference. The pump creates higher pressure to push blood through the circuit, while the beaker represents the downstream pressure. The flow rate follows Q = ΔP / R, so if the pump pressure equals the beaker pressure, the pressure difference ΔP is zero and no net flow occurs. In this simple setup, with no driving gradient, blood doesn’t move. Turbulence or any sustained flow would require a nonzero gradient or a change in resistance, which isn’t present when the pressures are equal.

Flow is driven by a pressure difference. The pump creates higher pressure to push blood through the circuit, while the beaker represents the downstream pressure. The flow rate follows Q = ΔP / R, so if the pump pressure equals the beaker pressure, the pressure difference ΔP is zero and no net flow occurs. In this simple setup, with no driving gradient, blood doesn’t move. Turbulence or any sustained flow would require a nonzero gradient or a change in resistance, which isn’t present when the pressures are equal.