Hi Bramha,

Before finding the heart rate of the person, we have to understand the relation between these three terms.

1. Heart Rate - It is the total number of beats per minute or bpm.

2. Cardiac Output - It is the volume of the blood pumped by the heart every minute.

3. Stroke Volume - It is the volume of the blood pumped by the ventricles every beat.

In short, the relation between these three will be, Cardiac Output (CO) = Heart Rate (HR) X Stroke Volume (SV).

We also have two terms that is EDV (End Diastolic Volume) and ESV (End Systolic Volume)

Stroke Volume = End Diastolic Volume - End Systolic Volume

Now,

The given values in above question are:

CO = 5 l/m

EDV = 100 ml

ESV = 50 ml

First we will find the SV => 100 - 50 = 50 ml/bt

Finding the Heart Rate, CO = HR X SV

5 l/m = HR X 50 ml/bt

5000 ml/m = HR X 50 ml/bt ( Converting L into ml)

HR = 5000/50 bt/m

HR = 100 bt/m   Ans.