If the radius of blood vessels of a person decreases his/her blood pressure will__________?
Correct answer: B. Increase
- A. Decrease
- B. Increase
- C. Remain Same
- D. Becomes zero
Explanation
For a given blood flow, reducing vessel radius greatly increases resistance because resistance varies inversely with the fourth power of radius, R ∝ 1/r^4. The heart must therefore generate greater pressure, so blood pressure tends to increase; students may choose decrease by assuming a narrower vessel carries less pressure rather than offering more resistance.
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