50. Name the structure:

45. Name the valve leaflets:

38. Name this structure:

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

44. Name the structures:

31. Name the chamber:

40. Name this structure:

16. Papillary muscles:

21. Isovolumetric contraction (in reference, of course, to the left side of the heart) is:

23. Severe hemorrhage (assuming a normal heart) would directly result in: