When you suddenly stand up after lying down for a while, your body may not compe

Question

When you suddenly stand up after lying down for a while, your body may not compensate quickly enough for the pressure changes and you might feel dizzy for a moment.

(a) If the gauge pressure of the blood at your heart is 12.41 kPa and your body doesn't compensate, what would the pressure be at your head, 50.8 cm above your heart? ____________kPa

(b) If the gauge pressure of the blood at your heart is 12.41 kPa and your body doesn't compensate, what would it be at your feet, 1.30 102 cm below your heart? Hint: The density of blood is 1060 kg/m3.__________ kPa

Explanation / Answer

(a) You need to multiply the change in height by the density of blood and with gravity divided by 1000 since everything is in kPa. Don't forget to convert your distance to meters before putting it into the equation. So:

(12.41 - 5.08) x(1060 x 9.8)/1000=7.61kPa

(b) (12.41-13.0) x(1060 x 9.8)/1000=6.12kPa

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