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Questions 27 through 31: Trace the path of excitation through the heart, starting at point of initiation. Number 27 should be

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Answer #1

27. Sinoatrial node

28. Atrioventricular node

29. Bundle of His

30. Left and right bundle branches

31. Purkinje fibres/cells

Located on the outer layer of the right atrium, the SA node (bundle of nerve cells) undersgoes spontaneous depolarization (contraction) to generate an action potential. The conducting tissue, also known as the AV node receives this action potential and passes it on through the bundle of His, then the left and right bundle branches and then the Purkinje fibres. All these tissues cause the contraction (depolarization) of the ventricular muscle cells.

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