why is the heart said to be 0 mmHg in standing position?

[ketap]

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hello. i want to ask the various pressure value when talking about the heart and circulation...i am having difficulties in understanding some contents and i would like to ask you:

1. i saw some textbook said that the heart has a 0 mmHg ( especially when they are talking about body positioning and the heart )...why? don't the systolic and diastolic pressure play role on the cardiac pressure and it is about 120 and 80,respectively..but why some textbook said the heart has 0 mmHg ?

2.if it is so, because the heart 0 mmHg and the feet is 90 mmHg while standing..why doesn't the fluid goes up to the heart instead (because the pressure is higher in the feet) ?
please help..

thx u for the attention 🙂

warm regards,ketap

 

[Step1Hash]

hello. i want to ask the various pressure value when talking about the heart and circulation...i am having difficulties in understanding some contents and i would like to ask you:

1. i saw some textbook said that the heart has a 0 mmHg ( especially when they are talking about body positioning and the heart )...why? don't the systolic and diastolic pressure play role on the cardiac pressure and it is about 120 and 80,respectively..but why some textbook said the heart has 0 mmHg ?

2.if it is so, because the heart 0 mmHg and the feet is 90 mmHg while standing..why doesn't the fluid goes up to the heart instead (because the pressure is higher in the feet) ?
please help..

thx u for the attention 🙂

warm regards,ketap

I think you are referring to gravitational hydrostatic pressure and not arterial pressure. The pressure of the blood in respect to gravity's effect is 0 mmhg at the heart bc that is where the pressure to pump the blood is generated. Below the heart there is positive pressure because gravity is pulling on it and above the heart there is negative pressure since blood flow is in the opposite direction of gravity. Blood leaving the heart going to the feet have both the pressure from the heart pumping as well as the pressure from gravity pulling on the blood (90-100 mmhg). In total, the arterial blood pressure takes both into account.

hope this helps.