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相关概念视频

Conduction System of the Heart01:19

Conduction System of the Heart

4.8K
Autorhythmicity is a term that refers to the heart's inherent ability to generate electrical signals and instigate muscle contractions. This self-regulating conduction system within the heart consists of two key components: the pacemaker cells and specialized conducting cells.
The pacemaker cells are located in two primary nodes: the sinoatrial (SA) node and the atrioventricular (AV) node. The SA node pacemaker cells can autonomously depolarize, triggering an action potential that leads to the...
4.8K
Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

2.3K
The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase...
2.3K
Cardiac Action Potential01:30

Cardiac Action Potential

1.1K
Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials
1.1K
Action Potential01:31

Action Potential

7.9K
Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they...
7.9K

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相关实验视频

Updated: Jun 13, 2025

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
09:20

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice

Published on: July 5, 2021

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鼠标心室室结节动作潜力和自动性的计算建模.

Chiara Bartolucci1, Pietro Mesirca2,3, Eugenio Ricci1

  • 1Computational Physiopathology Unit, Department of Electrical, Electronic and Information Engineering 'Guglielmo Marconi,', University of Bologna, Cesena, Italy.

The Journal of physiology
|September 13, 2024
PubMed
概括

这项研究介绍了小鼠心房节点 (AVN) 细胞动作潜力 (AP) 的详细计算模型. 该模型准确模拟AVN功能,并预测阻断关键离子电流对心脏节拍的影响.

关键词:
行动潜力 行动潜力 行动潜力在心房-心室节点.心脏电生理学心脏电生理学这是心肌细胞 (cardiomyocyte).这是计算机模拟的计算机模拟.离子通道 离子通道这里是鼠标鼠标鼠标鼠标鼠标鼠标.起器活动的起器活动.

更多相关视频

Programmed Electrical Stimulation in Mice
07:29

Programmed Electrical Stimulation in Mice

Published on: May 26, 2010

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High-resolution Optical Mapping of the Mouse Sino-atrial Node
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High-resolution Optical Mapping of the Mouse Sino-atrial Node

Published on: December 2, 2016

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相关实验视频

Last Updated: Jun 13, 2025

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
09:20

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice

Published on: July 5, 2021

3.0K
Programmed Electrical Stimulation in Mice
07:29

Programmed Electrical Stimulation in Mice

Published on: May 26, 2010

20.4K
High-resolution Optical Mapping of the Mouse Sino-atrial Node
11:07

High-resolution Optical Mapping of the Mouse Sino-atrial Node

Published on: December 2, 2016

15.7K

科学领域:

  • 心脏电生理学心脏电生理学
  • 计算生物学是一种计算生物学.
  • 心血管研究的心血管研究.

背景情况:

  • 房节点 (AVN) 对于心脏导电至关重要,但其细胞电生理机制尚未完全理解.
  • 现有的模型缺乏对离子电流和处理的全面表示.

研究的目的:

  • 开发小鼠AVN细胞动作潜力 (AP) 的详细计算模型.
  • 为了研究特定的离子电流和处理在AVN节拍中的作用.
  • 为模拟AVN功能和离子电流阻塞的影响提供一个工具.

主要方法:

  • 开发了一种小鼠AVN细胞AP的计算模型,具有精细的膜电流,交换器,处理和缓冲.
  • 对实验数据进行重新校准和验证模型.
  • 模拟了阻断各种离子电流的影响 (例如,If,Cav1.3,INa,r).

主要成果:

  • 该模型准确地复制了实验性AVN AP特征和瞬态.
  • 模拟显示,L型电流 (Cav1.2,Cav1.3) 和If在节拍中起着重要的作用.
  • 阻断Cav1.3或INa,r会停止发射;阻断If会使发射率降低11%.

结论:

  • 开发的计算模型是研究AVN节拍机制的宝贵工具.
  • 该模型促进了对处理和离子电流对AVN功能的贡献的理解.
  • 这项工作为未来的心脏电生理学和脉冲传播研究提供了一个强大的平台.