Question

10. During the QRS wave the ventricles __________ and contract.
hyperpolarize, repolarize, or depolarize
12. At what point on an EKG do semi-lunar valves open?
At the "Q" wave, throughout the ST segment, or at the "S" wave
13. The volume of blood left in each ventricle after the ventricles contract is called ______.
end diastolic volume, end systolic volume, afterload, or stroke volume
14.what is the equation for determining stroke volume?
EDV-ESV, end systolic volume-afterload, HR X ml of blood pumped out of the heart per beat, or preload-afterload
15. ventricular contraction occurs during which of the following?
QRS wave, ST segment, from mid P wave to end of T wave, or QT interval

Answer 1

10. Depolarise

During the QRS complex, the ventricles get depolarised.

T wave represent ventricular repolarisation

12. At Q wave

The semilunar valves opens at the Q wave

13. End systolic volume

It is the volume of blood in the ventricles after contraction

End diastolic volume is the amount of blood in the ventricles before contraction

14. EDV-ESV

The difference between end diastolic volume and end systolic volume will give the stroke volume

15. QRS

The ventricles contract during the QRS complex of the ECG

Hope this helps.... Thank you!!!