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31. Which event most directly produces the lub sound?

44. Which component of the conduction system fires first in the normal pathway?

37. Which blood vessel layer is made of simple squamous epithelium called endothelium?

43. If osmotic pressure is the dominant force at the venule end, what is the expected direction of fluid movement?

41. Which organ pair is noted as holding large volumes of blood?

18. Why are capillaries ideal for exchange?

3. If a valve prevents blood from flowing back into the left ventricle after ventricular systole, which valve is being described?

6. During ventricular systole, ventricular pressure rises. What happens to the AV valves?

11. Why do Purkinje fibers deliver impulses to the lower ventricles?

1. A student traces blood from body tissues back to the heart. Which chamber should receive this blood first?