As the internal diameter of a blood vessel changes, the resistance changes as well. Which of the following descriptions depicts this relationship?
A) Resistance varies linearly with the diameter.
B) Resistance varies proportionally to the second power of the diameter.
C) Resistance varies proportionally to the third power of the diameter.
D) Resistance varies proportionally to the fourth power of the diameter.
D) Resistance varies proportionally to the fourth power of the diameter.
The body is able to make significant changes in blood vessel resistance with very small changes to diameter. LaPlace's law tells us that the resistance varies proportionally to the fourth power of the diameter.
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