system
Given the following post, respond as if you're commenting on Reddit:
human
How does a "blood pressure" manometer measure the preasure of your blood?

The manometer cuff pressure plus atmospheric pressure is measured, and the cuff pressure is a response from squeezing your arm. By that logic, aren't we measuring the pressure of your arm as a whole (including other fluids/water, muscles, etc.)?
gpt
Blood pressure cuffs register three states when they activate.

First, they inflate to full, closing off the artery completely. Then they deflate slowly until it detects that blood flow is resumed, the point where your blood pressure is greater than the pressure of the cuff is your Systolic Pressure. Then it deflates further until the blood vessels have expanded to full, and no longer vibrate the cuff. The remaining air pressure in the cuff is considered your Diastolic Pressure.

In short, it is mostly checking your arm for vibrations caused by the abnormal blood flow caused by squeezing the arteries.