2. In class I calculated the \"work of the heart.\" Using the information provid

Question

2. In class I calculated the "work of the heart." Using the information provided below, what percentage of the total cardiac work is involved in increasing the kinetic energy of the venous blood inflow? This problem differs from the class example in that the cardiac output is now 15 liters/minute in vigorous exercise versus 6 liters/minute (resting conditions for the class problem) P, = PARTERIAL-100 mm Hg s= 10 mm Hg 2 VENOUS 01.05 gm/cc 980 cm2/sec ARTERIAL = 150 cm/sec 2VvENoUs-33 cm/sec w = work of the Heart (cm)

Explanation / Answer

50 to 55 % of total cardiac work is used to increase the kinetic energy of venous blood in flow.

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