First slide

Fluid dynamics

Question

In old age arteries carrying blood in the human body become narrow resulting in an increase in the blood pressure. This follows from

Easy

A

Pascal's law
B

Stoke's law
C

Bernoulli's prinicple
D

Archimedes principle

Solution

According to equation of continuity, av = a constant. It means, as area increases, velocity decreases.
Thus, as blood flows from narrow arteries to wider one, velocity decreases.
According to Bernoulli's theorem, $P + \frac{1}{2} {ρv}^{2} = a$ constant.
It means as velocity decreases, pressure increases.
Thus, when arteries become narrow, blood pressure increases.

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