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3. blood from the body enters the heart in point a...

# Question: blood from the body enters the heart in point a...

###### Question details

Blood from the body enters the heart in point A, at PA = 0.66 kPa above atmospheric. The pressure difference from the ambient pressure is typically defined as gauge pressure. Blood exits the right ventricle in point B on its way to lungs, at gauge pressure PB = 2.9 kPa. Oxygenated blood returns from the lungs in point C at gauge pressure PC = 1.00 kPa and is in turn returned to the circulatory system through artery D at gauge pressure PD = 13 kPa. The normal blood flow rate (at rest) is 90 cm3/s. The diameters of the veins and arteries are: dA = 3.0 cm, dB = 2.5 cm, dC = 2.8 cm, and dD = 2.0 cm.
Calculate the minimum power required (in watts) for operation of the human heart, assuming no heat effects and a constant blood density, 𝜌= 1 g/cm3. If the overall efficiency of the mammalian heart is about 15%, what is the actual power requirement?

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