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Cardiac Output

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Question

The human heart pumps 4 x 10 race to -3 m cube of blood per minute through the arteries under pressure 130mm. The density of blood is 1030 kg/m cube . What the horse power of the heart?[ 1 hp = 746 w = 746J/s]

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Solution

We know,
Power = Pressure Ã— Volume per second
Pressure = 130 mm = 17331.9 Pa
Volume per minute = 4 Ã— 10^-3 m³/min
=> Volume per second = (4 Ã— 10^-3)/60 m³/s
So,
Power = 17331.9 Ã— (4 Ã— 10^-3)/60 = 1.16 W
Or, power = 0.0015 hp

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