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bq elprie Sinoatrial node spontaneously fires an action potential action potentials move through Purkinje fibers and into ventricles action potentials travel through noncontractile cells to atrioventricular node action potentials travel down the atrioventricular bundle branches action potentials travel downwards through contractile myocardial cells in atrium action potentials in the atria stop at fibrous barrier action potentials travel upwards through contractile myocardial cells in ventricles action potentials travel out of sinoatrial node via gap junctions action potentials moving upwards through ventricles stop at fibrous barriers H

bq elprie Sinoatrial node spontaneously fires an action potential action potentials move through Purkinje fibers and into ventricles action potentials travel through noncontractile cells to atrioventricular node action potentials travel down the atrioventricular bundle branches action potentials travel downwards through contractile myocardial cells in atrium action potentials in the atria stop at fibrous barrier action potentials travel upwards through contractile myocardial cells in ventricles action potentials travel out of sinoatrial node via gap junctions action potentials moving upwards through ventricles stop at fibrous barriers H

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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Hello, May I get help with ordering this process please? I don’t understand it. An explanation would also be helpful!
1. Sinoatrial node spontaneously fires an action potential. 2. Action potentials move through Purkinje fibers and into ventricles. 3. Action potentials travel through noncontractile cells to atrioventricular node. 4. Action potentials travel down the atrioventricular bundle branches. 5. Action potentials travel downwards through contractile myocardial cells in atrium. 6. Action potentials in the atria stop at fibrous barrier. 7. Action potentials travel upwards through contractile myocardial cells in ventricles. 8. Action potentials travel out of sinoatrial node via gap junctions. 9. Action potentials moving upwards through ventricles stop at fibrous barriers.
Transcribed Image Text:1. Sinoatrial node spontaneously fires an action potential. 2. Action potentials move through Purkinje fibers and into ventricles. 3. Action potentials travel through noncontractile cells to atrioventricular node. 4. Action potentials travel down the atrioventricular bundle branches. 5. Action potentials travel downwards through contractile myocardial cells in atrium. 6. Action potentials in the atria stop at fibrous barrier. 7. Action potentials travel upwards through contractile myocardial cells in ventricles. 8. Action potentials travel out of sinoatrial node via gap junctions. 9. Action potentials moving upwards through ventricles stop at fibrous barriers.
Expert Solution
Step 1: Concept behind the electrical conduction system of the heart

The concept behind the electrical conduction system of the heart lies in the precise and coordinated regulation of electrical impulses that drive the rhythmic contractions of the heart's chambers. Here's a more detailed explanation of the concept:

1. SA Node (Sinoatrial Node):

  • Initiates electrical impulses in the right atrium.
  • Acts as the natural pacemaker of the heart.

2. Atrial Contraction:

  • Impulses move through atrial myocardial cells, causing the atria to contract.

3. AV Node (Atrioventricular Node):

  • Located near the tricuspid valve, it briefly delays the impulse.
  • Allows the ventricles to fill before contracting.

4. Bundle of His:

  • Carries the impulse from the AV node.

5. Bundle Branches and Purkinje Fibers:

  • Divide into right and left bundle branches, then Purkinje fibers.
  • Rapidly transmit the impulse to the ventricles, initiating ventricular contraction.

6. Fibrous Barriers:

  • Separate atria from ventricles and are found at the top of the ventricles.
  • Ensure sequential, coordinated contractions.

7. Continuous Cycle:

  • The cycle repeats with each heartbeat, maintaining rhythmic and synchronized heart function.

This system ensures efficient blood circulation by orchestrating the orderly contraction of the heart's chambers.

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