Q: Which of the following factors determine the velocity of flow in blood vessels?  

Answer: D

The velocity of blood flow in vessels is determined by various factors, such as the caliber of the blood vessel, the viscosity of blood, and the pressure difference between two ends of the blood vessel. The caliber of the blood vessel determines the resistance to blood flow, and as the caliber of the vessel decreases, the resistance increases, which causes the velocity of blood flow to decrease. Blood viscosity is another factor that influences blood flow velocity, as increased viscosity can lead to reduced flow. Lastly, the pressure difference between two ends of the blood vessel also plays a crucial role in determining blood flow velocity, as a greater pressure difference between two ends results in a higher velocity of blood flow.

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