Question

An individual is exercising at a cardiac output of 17000 ml/min, an end-diastolic volume of 138 ml/min and an end-systolic volume of 42 ml/min. What would be this person's heart rate?

Answer 1

Using the provided cardiac output, end-diastolic volume, and end-systolic volume, the heart rate during exercise is calculated to be approximately 177 beats per minute.

Step-by-step explanation:

The student is seeking to calculate the heart rate during exercise, given a cardiac output of 17000 ml/min, an end-diastolic volume (EDV) of 138 ml/min, and an end-systolic volume (ESV) of 42 ml/min. To calculate the heart rate, we must first calculate the stroke volume (SV), which is the amount of blood pumped by the heart in a single beat.

The formula for SV is SV = EDV - ESV. Therefore, SV = 138 ml - 42 ml, which equals 96 ml per beat. To find the heart rate (HR), we use the formula for cardiac output (CO), which is CO = HR × SV. By rearranging this formula to solve for HR, we get HR = CO / SV.

Substituting the known values, HR = 17000 ml/min / 96 ml/beat, which calculates to a heart rate of approximately 177 beats per minute (bpm).