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Using information provided in the text, calculate the power generated by the right ventricle during (a) restful state; blood flow 5 liter/min, and (b) intense activity; blood flow 25 liter/min.

Using information provided in the text, calculate the power generated by the right ventricle during (a) restful state; blood flow 5 liter/min, and (b) intense activity; blood flow 25 liter/min.

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
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Using information provided in the text, calculate the power generated by the right ventricle during (a) restful state; blood flow 5 liter/min, and (b) intense activity; blood flow 25 liter/min.
8.10 Power Produced by the Heart The energy in the flowing blood is provided by the pumping action of the heart. We will now compute the power generated by the heart to keep the blood flowing in the circulatory system. The power PH produced by the heart is the product of the flow rate Q and the energy E per unit volume of the blood; that is, cm erg PH = Q × E = Q × E erg/sec (8.9) sec cm² At rest, when the blood flow rate is 5 liter/min, or 83.4 cm³/sec, the kinetic energy of the blood flowing through the aorta is 3.33 × 10³ erg/cm³. (See pre- vious section.) The energy corresponding to the systolic pressure of 120 torr is 160 x 10° erg/cm³. The total energy is 1.63 x 10° erg/cm³the sum of the kinetic energy and the energy due to the fluid pressure. Therefore, the power P produced by the left ventricle of the heart is P= 83.4 x 1.63 × 10° = 1.35 × 10’ erg/sec = 1.35 W Exercise 8-9 shows that during intense physical activity when the flow rate increases to 25 liters/min, the peak power output of the left ventricle increases to 10.1 W. Section 8.11 Measurement of Blood Pressure 113 The flow rate through the right ventricle, which pumps the blood through the lungs, is the same as the flow through the left ventricle. Here, however, the blood pressure is only one sixth the pressure in the aorta. Therefore, as shown in Exercise 8-10, the power output of the right ventricle is 0.25 W at rest and 4.5 W during intense physical activity. Thus, the total peak power output of the heart is between 1.9 and 14.6 W, depending on the intensity of the physical activity. While in fact the systolic blood pressure rises with increa- sed blood flow, in these calculations we have assumed that it remains at 120 torr.
Transcribed Image Text:8.10 Power Produced by the Heart The energy in the flowing blood is provided by the pumping action of the heart. We will now compute the power generated by the heart to keep the blood flowing in the circulatory system. The power PH produced by the heart is the product of the flow rate Q and the energy E per unit volume of the blood; that is, cm erg PH = Q × E = Q × E erg/sec (8.9) sec cm² At rest, when the blood flow rate is 5 liter/min, or 83.4 cm³/sec, the kinetic energy of the blood flowing through the aorta is 3.33 × 10³ erg/cm³. (See pre- vious section.) The energy corresponding to the systolic pressure of 120 torr is 160 x 10° erg/cm³. The total energy is 1.63 x 10° erg/cm³the sum of the kinetic energy and the energy due to the fluid pressure. Therefore, the power P produced by the left ventricle of the heart is P= 83.4 x 1.63 × 10° = 1.35 × 10’ erg/sec = 1.35 W Exercise 8-9 shows that during intense physical activity when the flow rate increases to 25 liters/min, the peak power output of the left ventricle increases to 10.1 W. Section 8.11 Measurement of Blood Pressure 113 The flow rate through the right ventricle, which pumps the blood through the lungs, is the same as the flow through the left ventricle. Here, however, the blood pressure is only one sixth the pressure in the aorta. Therefore, as shown in Exercise 8-10, the power output of the right ventricle is 0.25 W at rest and 4.5 W during intense physical activity. Thus, the total peak power output of the heart is between 1.9 and 14.6 W, depending on the intensity of the physical activity. While in fact the systolic blood pressure rises with increa- sed blood flow, in these calculations we have assumed that it remains at 120 torr.
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