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Circulatory System Questions 1. What are the names of all four heart valves? 2. Why do both veins and the heart need 1-way valves? What function do they have in common? What is different about their function? 3. What are some differences between veins and arteries? Also why are they different? 4. Name 4 structures that are part of the electrical system of the heart. Place them in order of conduction. Also, why is one of them called the pacemaker? 5. What part of the cardiac cycle is intrinsic control in charge of, and extrinsic control? Also what ARE the intrinsic and extrinsic controls generated by? 6. What are the three layers of the heart tissue? 7. Why is it a good idea to have a septum in the heart? In other words, two keep the two halves apart?