Blood pressure measured in a major artery is highest
- A. where the artery is narrowest
- B. where the blood flows fastest
- C. where the vessel is widest and the blood moves slowest
- D. at the capillaries
Explanation
Bernoulli's principle applies inside the body as well: where the cross section is large the speed is low and more of the energy remains as pressure. Where a vessel narrows, the blood accelerates and the lateral pressure on the wall falls. This is one reason an aneurysm, a widened weak spot, experiences a higher pressure and tends to grow.
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