Question

question 15
what is the relationship between vasodilation and blood flow? when blood vessels dilate, blood flow to adjacent regions ______.

• increases
• decreases

question 16
compare blood flow to xors legs before and after administering vasodilators to xor. after administering vasodilators, would blood flow to xors legs likely increase, decrease, or stay the same?

• increase
• stay the same
• decrease

Explanation:

Analyze local resistance changes

When blood vessels in a specific tissue dilate, their resistance to blood flow decreases. According to the principles of Hemodynamics and Ohms Law of Blood Flow, blood flow is inversely proportional to resistance:

$$ F = \frac{\Delta P}{R} $$

A decrease in local resistance leads to a substantial increase in blood flow to that specific dilated region.

Determine effect on adjacent regions

Because total blood volume is finite, when blood vessels in one region dilate and receive a larger share of the cardiac output, the relative blood flow to neighboring, non-dilated adjacent regions decreases. This is a classic redistribution of blood flow. Therefore, for Question 15, when blood vessels dilate, blood flow to adjacent regions decreases.

Analyze systemic vasodilation in target organs

For Question 16, we are asked about the direct effect of administering vasodilators on the target area (Xor's legs). Administering vasodilators directly dilates the blood vessels supplying the legs, which decreases vascular resistance in the legs. According to Ohms Law of Blood Flow, this reduction in resistance directly causes blood flow to the legs to increase.

Answer:

Question 15

• increases
• decreases (Correct answer)

Question 16

• increase (Correct answer)
• stay the same
• decrease