The Heart and Circulation

27. Label the diagram of cardiac muscle contraction.28. What is another name for a single heart beat?29. What is systole and diastole?30. What are the heart sound and what causes them?31. Name the two numbers that make up blood pressure and discuss the actions of theheart that cause each number.32. The fact that the nervous system does not control the heartbeat, but that the heartbeats all on its own is called what?33. What part of the conducting system of the heart is called the natural cardiacpacemaker? Why is it called this?