What is the major determinant of the resistance that blood encounters as it flows through the systemic circulation?
A)Volume of blood in the systemic circulation
B)Muscle layer of the metarterioles
C)Muscle layer of the arterioles
D)Force of ventricular contraction

Question

Quizplus · Accepted Answer

The muscle layer of the arterioles constricts or dilates depending on the stimulation it receives. The change in the diameter of the vessels determines the resistance to blood flow. Blood viscosity usually stays the same; however severe fluid loss can increase it, leading to an increase in resistance. This is not the major determinant however. The force of contraction does not determine resistance to flow.

What Is the Major Determinant of the Resistance That Blood