Question

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

• A. Pascal's law
• B. Stoke's law
• C. Bernoulli's principle
• D. Archimede's principle.

Answer 1

The correct option is C Bernoulli's principle

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,
$P+\frac{1}{2}\rho v^2=a$ constant
It means, as velocity decreases, pressure increases. Thus, when arteries become narrow, blood pressure Increases.