What is blood pressure? How it is measured? What is systolic and diastolic pressure? [3 MARKS]

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Solution

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1. The force that blood exerts against the wall of a vessel is called blood pressure. This pressure is much greater in arteries than in veins.
2. Blood pressure is measured with an instrument called sphygmomanometer.
3. The pressure of blood inside the artery during ventricular systole (contraction) is called systolic pressure and pressure in artery during ventricular diastole (relaxation) is called diastolic pressure. The normal systolic pressure is about 120 mm of Hg and diastolic pressure is 80 mm of Hg.

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What is blood pressure? How is it measured? Differentiate between systolic and diastolic pressure.

Q. What is blood pressure? What is the difference between systolic and diastolic blood pressure?

Question 116 (i)

Health Application A doctor reports blood pressure in millimetres of mercury (mm Hg) as a ratio of systolic blood pressure to diastolic blood pressure (such as 140 over 80). Systolic pressure is measured when the heart beats and diastolic pressure is measured when it rests. Refer to the table of blood pressure ranges for adults.

Manohar is a healthy 37 yr old man whose blood pressure is in the normal category.
Calculate an approximate ratio of systolic to diastolic blood pressures in the normal range.

Question 116 (iii)

Health Application A doctor reports blood pressure in millimetres of mercury (mm Hg) as a ratio of systolic blood pressure to diastolic blood pressure (such as 140 over 80). Systolic pressure is measured when the heart beats and diastolic pressure is measured when it rests. Refer to the table of blood pressure ranges for adults.
Manohar is a healthy 37 yr old man whose blood pressure is in the normal category.
Calculate the ratio of average systolic to average diastolic blood pressures in the prehypertension category.

Q. Normal systolic and diastolic value of blood pressure is

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