In a primary nodal block of the conduction system to the hea

In a primary nodal block of the conduction system to the heart. an action potential generated by the SA nod is not conduced to the AV node. Which of the following would likely result? the ventricles would not contract the ventricles would contract at a slower rate than normal the atria would contract faster than normal the atria and ventricles would contract at the same time If the end diastolic volume is 120ml, and the end systolic volume is 30ml, What will the cardiac output be at a heart rate 130 beats per minute? 12 liter/minute 9.2 liter/minute 11.7 Liter/minute 10.8 liter/minute

Solution

20. answer : b

the ventricles would contract at slower rate than normal.

21. answer : C

end diastolic volume = 120ml

end systolic volume = 30ml

strove volume = end diastolic volume ---   end systolic volume = 120ml - 30ml = 90ml

Cardiac output = strove voume x heart rate (beat/min)

                           90ml x 130 heart beat /min = 11.7 liters/min.