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

Step-by-step solution

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+ 1 2 v^2= constant As velocity decreases, pressure increases. Thus when arteries become narrow, blood pressure increases.