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Please explain why answer A is wrong, and explain which one is the correct answer and why. Question: Blood flows through...

Please explain why answer A is wrong, and explain which one is the correct answer and why.

Question:

Blood flows through an artery with a partial blockage, which narrows the diameter of the blood vessel for a small segment of the total length. How does the pressure in the narrow portion of the blood vessel compare to the pressure just before the partial blockage? Assume that frictional effects have a negligible impact on the situation.

a. The pressure is higher in the narrow portion

b. The pressure is the same in the narrow portion as before it

c. The pressure is lower in the narrow portion

d. It depends on the person’s blood pressure measurements

e. It depends on the strength of the person’s heart

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Answer #1

Using Bernoullis equation for same height flow,

P1 + 0.5rho*v1^2 = P2 + 0.5*rho*v2^2

Since velocity in narrow portion v2 is larger, so pressure P2 has to be smaller. So option a is wrong and c is correct

option c is correct.

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