• # question_answer In old age arteries carrying blood in the human body become narrow resulting in an increase in the blood pressure. This follows from A)  Pascal's law                            B)  Stoke's law C)  Bernoulli's principle                       D)  Archimedes' principle

Applying the continuity theorem Av = constant When area is increased, the velocity will decrease. Hence, if blood flows from narrow arteries to wider arteries, velocity decreases. Now, according to Bernoulli's principle$p+\frac{1}{2}\,\rho {{v}^{2}}=$ constant From the above relation, it is quite clear that if velocity decreases the pressure will increase,