The blood-pressure numbers are in units of mm-Hg. That's the pressure at
the bottom of a column of mercury that's that many millimeters tall.
For a comparison, a typical healthy systolic pressure may be 120. On exactly
the same scale and in the same units, the Earth's atmospheric pressure at
sea level is 760 . If your blood pressure were 760, it wouldn't be for long,
because you would most likely explode.
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It's millimiters of mercury (mmHg). Also blood pressure is given as systolic BP/dystolic BP.
The BP is expressed in systolic pressure over diastolic pressure in millimeters of mercury (mmHg).
The SI standard unit for measuring length is the meter (m).
The standard unit for measuring length and distance is the meter (m) in the metric system.
Seconds
The standard unit that is the same in all systems of units is the second, which is the base unit for measuring time.
The standard SI unit for measuring mass is the kilogram (kg).