What are the pacemaker cells of the Heart and their normal heart rates?

What are the difference between contractile cells of the heart and electrical cells responsible for generation and conduction of impulses. Why is the cardiac action potential propagated more slowly in an AV node cell than in an atrial or ventricular myocyte? How are the channels and ions that are responsible for depolarization and repolarization work? How can be AV conduction affected by hypokalemia?

What are the three populations of cells in the heart that can act as pacemakers? How do they differ?

How are events of the cardiac cycle reflected in pressure and volume changes within the cardiac chambers?

What are the values of pressure inside heart chambers?

What is the significance of atrio-ventricular node and atrio-ventricular bundle in the functioning of heart?

Which cardiac events do the P wave, QRS complex, and T wave represent?

What role does the AV nodal delay play in normal cardiac function?

How do the compensatory responses triggered in heart failure work to restore cardiac output, and how might they lead to remodeling and progression?

What is meant by cardiac output, and what is a normal value for an adult male?