During heart development, the primary outcome of cardiac looping is Fusion of the aortic sac vessels of the branchial arches Appearance of pacemaker cells in the right atrium and top of left ventricle Formation of the contrucal segments Fusion of the right atrium with the right ventricle followed by formation of the ventricular septum. Levo-transposition of the great arteries

The maximum amount of blood within the left ventricle just before the start of isovolumic contraction is called the ____________________ (EDV, ESV, EF).  The amount of blood found within the left ventricle just after ejection and before the left AV valves opens is called the _____________________ (EDV, ESV, EF).  Clinically, one of the best parameters used to measure cardiac function is the EF.  In terms of EDV and ESV, what simple equation would give you the EF?  If you had an echocardiogram and found that your EDV was 100 cc and your ESV was 30 cc, what would be your EF?  EDV = end-diastolic volume, ESV = end-systolic volume, EF = ejection fraction

Describe the structures of the heart and the direction of flow through each structure ( Name them and  what happens next) sequentially.

Which of the following intervals is most likely to vary when the heart rate changes? QRS complex     P-R segment     S-T segment     T-P segment