1.

(i) What is meant by blood pressure ? Which instrument the doctor uses to measure it ? (ii) What is the harmful effect of high blood pressure on our health ?

Answer» (i) Blood pressure is the pressure against the walls of the blood vessels produced by the discharge of blood into them by contraction of the left ventricle of the heart , sphygmomanometer.
(ii) A persistent high blood pressure results from narrowing arterial lumen and reduced elasticity of arterial walls in old age. It can cause repturing of capillaries and is a silent killer.


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