Question

a certain persons heart beats 1.2 times per second and pumps 1.0 x 10-4 m3 of blood per beat against an average pressure of 14 kpa. the power output of the heart is

Answer 1

Given:

Heart beat rate =  1.2 times per second

Volume of blood pumped =   1.0 x 10-4 m3 of blood per beat.

Pressure = 14Kpa .

To Find:

The power output of the heart.

Solution:

Power output of the heart is given by pressure x volume of blood x heart rate.

Therefore,

• Power = pressure x volume x heart beat

• P = 14 x 10³ x $10^{-4}$ x 1.2
• P =  1 . 68 Watt

Therefore,

The power output of the heart is 1.68 W.