Which of the following is NOT an important source of resistance to blood flow? Which of the following is NOT an important source of resistance to blood flow? total blood volume vessel length vessel diameter blood viscosity

Total blood volume

Explanation:

Blood flow refers to the movement of blood into the blood vessels. The blood flows into the blood vessels due to the pressure applied by the heart and the concentration gradient that is from higher to lower value.

The blood flow like other fluids face some resistance and the factors which influence the blood flow are the vessel length, viscosity of blood, diameter and length of the blood vessels.

Among these factors, the factor which does not cause resistance is the total volume of the blood as the volume of the blood increases the blood flow increases. Except for blood volume, all these factors are inversely proportional to the blood flow.

Thus, Total blood volume is the correct answer.