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A heartbeat starts when autorhythmic cells in the 1 [ Select ] (located in the right atrium) create an action potential (electric signal). From there, the signal passes along the internodal pathway to the 2 [Select ] causing the atria to contract. After a slight pause, the signal travels to the 3 [ Select ] , which divides into left and right bundle branches and carries the signal down through the 4 [ Select] to the apex of the heart. At that point, specialized 5 [ Select ] carry the signal to individual cardiac muscle cells and the 6 [ Select ] contract.

A heartbeat starts when autorhythmic cells in the 1 [ Select ] (located in the right atrium) create an action potential (electric signal). From there, the signal passes along the internodal pathway to the 2 [Select ] causing the atria to contract. After a slight pause, the signal travels to the 3 [ Select ] , which divides into left and right bundle branches and carries the signal down through the 4 [ Select] to the apex of the heart. At that point, specialized 5 [ Select ] carry the signal to individual cardiac muscle cells and the 6 [ Select ] contract.

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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A heartbeat starts when autorhythmic cells in the 1 [ Select ] (located in the right atrium) create an action potential (electric signal). From there, the signal passes along the internodal pathway to the 2 [ Select] causing the atria to contract. After a slight pause, the signal travels to the 3 [ Select ] , which divides into left and right bundle branches and carries the signal down through the 4 [ Select ] to the apex of the heart. At that point, specialized 5 [ Select ] carry the signal to individual cardiac muscle cells and the 6 [ Select ] contract.
Transcribed Image Text:A heartbeat starts when autorhythmic cells in the 1 [ Select ] (located in the right atrium) create an action potential (electric signal). From there, the signal passes along the internodal pathway to the 2 [ Select] causing the atria to contract. After a slight pause, the signal travels to the 3 [ Select ] , which divides into left and right bundle branches and carries the signal down through the 4 [ Select ] to the apex of the heart. At that point, specialized 5 [ Select ] carry the signal to individual cardiac muscle cells and the 6 [ Select ] contract.
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