There are baroreceptors in your venous systems, that detect changes in blood pleasure and sends nervous signals for the body to increase/decrease blood pressure accordingly, to maintain it steady.
One way for you to maintain body pressure is by increasing/decreasing your heart rate.
When you breath, you activate the baroreceptors in your chest area by expanding/compressing your mediastine. (every inhale exhale affects almost instantly your heart beat rate)
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