Question

what would had happen if the atmospheric pressure was same as our blood pressure​

Answer 1

In addition to cold weather, blood pressure may also be affected by a sudden change in weather patterns, such as a weather front or a storm. Your body — and blood vessels — may react to abrupt changes in humidity, atmospheric pressure, cloud cover or wind in much the same way it reacts to cold
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Answer 2

Answer:

Blood in our body, which flows through blood vessels and every cell of the body.  Exerts pressure on the walls of the blood vessels, blood pressure.  The atmospheric pressure acting on our body from outside is balanced with blood pressure. The blood pressure exerts a slightly greater force to nullify the atmospheric pressure. But not large enough to cause any damage. Which is why we are still safe and sound.

If there wasn't blood pressure then we would have crushed by the atmospheric pressure.

Also if, the atmospheric pressure of earth becomes zero suddenly then the blood will exert much pressure on the blood vessels.