9. Table 1 shows the volume of blood in a woman’s left ventricle at different times during one second. Table 1 Time / seconds Volume of blood in left ventricle / cm3 0.0 112 0.1 120 0.2 95 0.3 65 0.4 50 0.5 55 0.6 82 0.7 90 0.8 100 0.9 112 1.0 120
0 9 . 1 Use Table 1 to calculate the heart rate in beats per minute. Tick () one box next to the correct answer. [1 mark] 60 66.7 75 85.7
0 9 . 2 The stroke volume is the volume of blood pumped out of the left ventricle during one cardiac cycle. Use Table 1 to determine the stroke volume.
The answer for the first one is 66.7 and the answer for the second is 70.
Hi~ For 9.1, one heart beat is 1 cardiac cycle so you would look for the times where the volume of blood is the same and find the difference. In this case it is 0.9s (112cm^3) and to find the heart rate you do 1 divided by time for one beat x 60 To find stroke volume you find the difference between the maximum and minimum volume, so 120-50 is 70 Hope this helps
Hi~ For 9.1, one heart beat is 1 cardiac cycle so you would look for the times where the volume of blood is the same and find the difference. In this case it is 0.9s (112cm^3) and to find the heart rate you do 1 divided by time for one beat x 60 To find stroke volume you find the difference between the maximum and minimum volume, so 120-50 is 70 Hope this helps