Chapter V: How the Blood Moves

26. “ The Arteries, Capillaries, and Veins 51

27. “ The Sheep’s Heart 55

28. “ The Course of the Circulation 58

29. “ Why the blood moves in one direction only; the Valves
of the Veins 64

30. “ The Tricuspid Valves of the Heart 66

31. “ The pulmonary Semilunar Valves 71

32. “ The left side of the Heart 72

33. “ What makes the blood move at all: The beat of the Heart 76

34. “ The action of the Heart as a whole 79

35. “ The Capillaries and the Tissues 82