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Which of the following changes would cause the greatest increase in resistance? a. Doubling the radius...

Which of the following changes would cause the greatest increase in resistance?

a. Doubling the radius of a blood vessel

b. Decreasing the radius of a blood vessel by 1/2

c. doubling the pressure gradient

d. Doubling blood viscosity

e. Doubling blood vessel length

science   Anatomy-And-Physiology   
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Answer #1

Answer

B) decreasing the radius of blood vessels by 1/2

Explanation :- blood Vessel resistance (R) is directly proportional to the length (L) of the vessel and the viscosity (η) of the blood, and inversely proportional to the radius to the fourth power (r4).

Hence decrease in radius would increase the resistance more compared to other factors.

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