What is blood pressure ? How is it measured ?

What is blood pressure?(b)What are noraml value of systolic and diastolic blood pressure(c) How is it measured?(d) Name the instrument used to measure blood pressure?

What is blood pressure? Explain

What is the cause of gas pressure ? How is it measured ?

What is the cause of gas pressure ? How is it measured ?

In which part of our body, the blood pressure is measured?