Which one of the following is considered normal blood pressure in man?

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Q: 94 (CDS-II/2009)
Which one of the following is considered normal blood pressure in man?

question_subject: 

Science

question_exam: 

CDS-II

stats: 

0,13,10,2,7,13,1

keywords: 

{'normal blood pressure': [1, 0, 1, 0], 'mm water': [0, 0, 1, 0], 'mm blood': [0, 0, 1, 0], 'mm air': [0, 0, 1, 0], 'mm mercury': [0, 0, 2, 0]}

Option 1: 120/80 mm water. This option is incorrect. Blood pressure is measured in millimeters of mercury (mmHg), not water.

Option 2: 120/80 mm blood. This option is incorrect. Blood pressure is measured in millimeters of mercury (mmHg) using a sphygmomanometer, which measures the pressure in the arteries.

Option 3: 120/80 mm mercury. This option is correct. Normal blood pressure in adults is typically around 120/80 mmHg. The first number (systolic pressure) represents the pressure in the arteries when the heart beats, while the second number (diastolic pressure) represents the pressure in the arteries when the heart is at rest between beats.

Option 4: 120/80 mm air. This option is incorrect. Air is not used to measure blood pressure. A sphygmomanometer uses a column of mercury to measure blood pressure.

In conclusion, the correct answer is Option 3, 120/80 mm mercury, which represents the normal blood pressure in adults.