The following questions are to be answered in complete sentences, using correct
grammar and spelling.
2. After a severe heart attack, a patient's ECG reveals a normal sinus (SA) rhythm (70 beats per
minute) in the atria, however the ventricular contractions are less than 40 beats per minute.
What part of the conduction system most likely has been damaged in this patient? Explain
your reasoning. (2 points)
3. What feature of cardiac muscle compared to skeletal muscle do you think makes cardiac
muscle more sensitive to fluctuations in blood calcium levels? (2 points)
4. Fibrillation is one example of an arrhythmia seen in the heart. Fibrillation can occur in either
the atria or the ventricles. Which type of fibrillation, atrial or ventricular, is more dangerous?
Explain why (i.e., what happens in each case, what happens to blood flow through and out of
the heart?). (2 pts)
2 the atrial rhythm is normal implies that SA node is normal. So the problem is in AV node or ventricular conducting system... View the full answer