Solved by a verified expert:1)Describe the heartbeat by explaining the cardiac conduction system. Be specific in your response and describe in detail all phases of the conduction system. What is the intrinsic heart rate and what slows this rate to the normal physiologic rate of a healthy adult.2)You are a red blood cell and have just returned to the heart via the inferior vena cava. Explain in detail where you go through the heart – in order – including all chambers and associated structures. Lastly, as you leave the heart, where are you going and what is your primary role?3)Describe in detail B cell activation. Begin with B cell sensitization and follow through with all molecular events leading to its activation. Lastly, describe immunologic memory as it pertains to these lymphocytes as well as its importance.4)Describe the flow of lymph through a lymph node. Include in your answer all regions and cell types that the lymph passes as it moves through. Explain why lymph remains in the node for a defined period of time, the importance of that and lastly, describe where the lymph goes once exiting the node.