Question

The work done by the heart is 1J per beat. Calculate the power of the heart if it beats 72 times in a minute
A. 1.2hp
B. 1.2$eV{s^{ - 1}}$
C. 1.2W
D. None of these

Answer 1

Hint: We have to calculate the power of the heart beat. it is equal to the work done per second.

Complete step by step solution:
 Given,
Work done by the heart is 1 Joule per beat
Number of beats in a minute is 72 minutes
The time taken is 1 minutes, we change 1 minutes into seconds because the standard unit of time is second.
So, 1minutes = 60seconds
Now, we calculate the number of beats per second,
So, the expression to solve the number of beats per second is
$Number\;of\;beats\;per\;\sec ond = \dfrac{{72}}{{60}}$
So, after solving the number of beats per second is 1.2/s
Now, we calculate the power of the heart,
 The power of the heart is equal to the Work done per second.
The expression is
$Power\;of\;heart = Work\;done\;per\;\sec ond{\text{ }}$
The work done per second is equal to the product of the work done per beat and number of beats in a second
So, the expression to solve,
$Work\;{\text{done per second}} = Work\;done\;per\;beat\; \times \;number{\text{ }}of\;beat\operatorname{s} \;in\;a\;\sec ond$
So, we have to calculate the power of heart
$ Power\;of\;heart\; = 1Joule\; \times \;1.2{s^{ - 1}}$
  $Power\;of\;heart\; = 1.2W $
So, the power of the heart is 1.2Watt.

So, the correct answer is “Option C”.

Note: The electrical system of our heart is the power of source that makes this possible. Our heartbeat is triggered by the electrical impulses that travel down a special pathway through our heart. The power of the heart is calculated by multiplying the pressure by the flow of the rate. The pressure of the heart is about 10000 Pascal, making the heart’s power about one watt.