Please answer the following questions:
1.- Where is located the primary heart pacemaker? What is its function? What is the normal heart rate for adults?
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2.- Please name the vessels originated from the aortic arc.
3.- What is the Portal vein, and its importance? Please name the vessels that give origin to the Portal Vein.
4.- Please describe the blood flow in the pulmonary circuit.
5.- What is the lymphatic system? What are the main functions of the lymphatic system?