Why heart rate / blood pressure varies with body position?

AP Bio We have a heart rate / pressure lab. The only question I can not answer is this. I know that the heart rate / BP is higher when you stand, unlike the definition, I do not know the explanation for that. I already tried google. I do not really find any information of interest. Anyone have an answer for that? And Do you have anything to do with the hydrostatic pressure .. or something? Yes please and thanks: D

When you get up, your heart has to work harder to send blood to the head. To this end, the pressure is higher. If you lie, the heart does not have to push so hard. Gravity is a factor here. When your muscles need more oxygen during exercise, more blood is pumped through the body, the pressure blod here too.

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