Additional How does this relate to the variation in blood pressure?
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In mammals, inhalation is an effort made possible by several chest muscles, who flex, pulling the area around the lungs. It creates then an area of negative pressure (a vacuum, which makes the air go into the lungs to even the pressure levels. Then, the muscles relax, and the lungs collapse, expelling the air.
So when we inhale, there’s actually more pressure in the thorax (where the heart and blood vessels are) and they have to pump blood at a higher rate to meet usual demands. Hence the higher heart rate.
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