How many seconds will it take to pump all the blood in body through the heart?

Question

The average blood volume in human is 34 mL blood per pound bodyweight. At rest for each heartbeat, the heart pumps 70 mL of blood. For a person of 150 pounds, resting heart rate of 80 beats per minute, how many seconds will it take to pump all the blood in body through the heart?

Answer 1

Hi Dom,

 

Let's take these unit conversion calculations
step-by-step:

    1.  Calculate number of ml of blood:

             (150 lbs)(34 ml / lb) = 5100 ml

    2.  Calculate number of heart beats:

             (5100 ml)(1 beat / 70 ml) = 510/7 beats

    3.  Calculate number of minutes:

             (510/7 beats)(1 min / 80 beats) =
                                           51/56 min

    4.  Calculate number of seconds:

             (51/56 min)(60 sec / min) = 765/14
                                                  = 54.6 sec

 

The challenge for these unit conversion calculation problems is to do the required unit conversions in the right order.

 

Thanks for submitting this problem and glad to help.

 

God bless, Jordan.