Indicate the Relative Comparison of Each of the Paired Items

Indicate the relative comparison of each of the paired items by writing the appropriate letter in the blank using the following answer code:
a. A is greater than B.
b. B is greater than A.
c. A and B are equal.
_____ A. Blood flow through an arteriole upon increased sympathetic activity.
B. Blood flow through an arteriole upon decreased sympathetic activity.
_____ A. Blood flow through a vein upon increased sympathetic activity.
B. Blood flow through a vein upon decreased sympathetic activity.
_____ A. Velocity of blood flow through the veins.
B. Velocity of blood flow through the capillaries.
_____ A. Local arteriolar radius in the presence of local decreased O₂ concentration and increased CO₂ concentration.
B. Local arteriolar radius with normal local concentration of O₂ and CO₂.
_____ A. Circulation through the skin during exercise.
B. Circulation through the skin at rest.
_____ A. Circulation to the brain at rest.
B. Circulation to the brain during exercise.