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38. Name this structure:

46.  Name the structures:

28. When a cardiac muscle action potential is present, but there is insufficient calcium to result in mechanical action (muscle contraction), the result is described as:

36.  Name this wall:

25. A dilatation at the bases of aorta & pulmonary trunk that presumably provides space for the semilunar valve apparatus when opened is called the:

13. If the aortic valve did not open well (aortic stenosis), what would be the primary problem?

30. A fixed, split S-2 can be due to:

44. Name the structures:

33. Name the chamber wall:

42. Is this the wall of the left ventricle or the right ventricle?