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In old age arteries carrying blood in the human body become narrow resulting in an increase in the blood pressure. This follows from
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Verified Answer
The correct answer is:
Bernoulli's principle
According to continuity theorem as $a v=$ constant as area increases velocity decreases. So
when blood flows from narrow arteries to wider one, velocity decreases. According to Bernoulli's principle,
$$
P+\frac{1}{2} \rho v^2=\text { constant }
$$
As velocity decreases, pressure increases. Thus when arteries become narrow, blood pressure increases.

when blood flows from narrow arteries to wider one, velocity decreases. According to Bernoulli's principle,
$$
P+\frac{1}{2} \rho v^2=\text { constant }
$$
As velocity decreases, pressure increases. Thus when arteries become narrow, blood pressure increases.

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