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Chapter 15: Problem 81

How does the blood flow speed at a stenosis compare with the speed in the surrounding artery? a. lower b. the same c. higher

Short Answer

Expert verified
c. higher

Step by step solution

01

Understand the Physiology Behind the Problem

It is important to understand that the blood flow in our body must remain constant. This means the total amount of blood flowing into an artery must equal the amount of blood flowing out.
02

Apply the Continuity Equation

According to the continuity principle in fluid dynamics, the product of cross-sectional area (A) and speed (V) at any point along the fluid's flow is constant (A1*V1=A2*V2), meaning if the area decreases at a point like a stenosis, the speed of the blood must increase to maintain the constant flow.
03

Infer Based on the Continuity Principle

Based on the continuity equation, a narrowing or constriction in the blood vessel (stenosis) would decrease the cross-sectional area, and thus increase the blood flow speed at that point in order to maintain the constant blood flow. Therefore, the speed of blood at stenosis will be higher as compared to the surrounding artery.

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