Questions -
Q1. After a severe heart attack, a patient's ECG reveals a normal sinus (SA) rhythm (70 beats per minute) 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.
Q2. What feature of cardiac muscle compared to skeletal muscle do you think makes cardiac muscle more sensitive to fluctuations in blood calcium levels?
Q3. 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.