Question

Calculate cardiac output if the heart rate is 85 beats/minute, end-diastolic volume (EDV) is 130 ml, and end-systolic volume (ESV) is 60 ml.

Answer 1

Cardiac output is calculated by multiplying the stroke volume (70 mL) by the heart rate (85 beats/minute), resulting in a cardiac output of 5,950 mL/minute or 5.95 L/minute.

Step-by-step explanation:

To compute the cardiac output (CO), we need to know the stroke volume (SV), which is the difference between the end-diastolic volume (EDV) and the end-systolic volume (ESV). In this scenario, the SV is calculated by subtracting the ESV from the EDV, which yields SV = 130 mL - 60 mL = 70 mL. Next, we calculate the CO by multiplying the SV by the heart rate (HR), which provides us with CO = 85 beats/minute × 70 mL/beat.

Now, after multiplying these two values, we find that the CO is 5,950 mL/minute, or 5.95 L/minute.The significance of stroke volume lies in its ability to determine the volume of blood pumped by the heart in each contraction, while heart rate indicates the number of times the heart contracts per minute. Together, these variables are essential in determining the efficiency and performance of the cardiovascular system.