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相关概念视频

Relaxation of Skeletal Muscles01:29

Relaxation of Skeletal Muscles

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The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions.
When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open....
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Action Potential01:14

Action Potential

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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 receive...
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Action Potential: Phases of Stimulation01:28

Action Potential: Phases of Stimulation

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The action potential is a complex electrical event that occurs in excitable cells, such as neurons and muscle cells. It consists of several distinct phases, each with specific characteristics.
Resting Phase:
In this phase, the cell's membrane is at its resting potential, typically around -70 millivolts (mV) for neurons. Inside the cell, there is a higher concentration of potassium ions (K+) and a lower concentration of sodium ions (Na+). Voltage-gated sodium channels are closed, and...
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Smooth Muscle Contraction01:25

Smooth Muscle Contraction

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Smooth muscle contraction is a complex process vital for various bodily functions, from maintaining blood vessel tension to facilitating the movement of food through the digestive tract. Unlike striated muscles, smooth muscle contraction begins more slowly and lasts longer.
The onset of contraction is triggered by an increase in calcium ions within the sarcoplasm, similar to the process in striated muscle. However, smooth muscles have a relatively smaller reservoir of the sarcoplasmic...
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Antihypertensive Drugs: Action of Calcium Channel Blockers01:18

Antihypertensive Drugs: Action of Calcium Channel Blockers

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Calcium ions are essential to contract smooth muscle cells in blood vessels. They enter these cells through voltage-dependent calcium channels, specifically L-type calcium channels in the cell membrane. These L-type calcium channels are integral to the excitation-contraction coupling process in smooth muscle. When a stimulus is received by smooth muscle cells, their membrane depolarizes. This alteration in membrane potential instigates the opening of L-type calcium channels. As a result,...
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Cardiac Action Potential01:30

Cardiac Action Potential

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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
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相关实验视频

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Focal Ca2+ Transient Detection in Smooth Muscle
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Focal Ca2+ Transient Detection in Smooth Muscle

Published on: June 29, 2009

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尿道光滑肌中的动作潜能耐火期是由Ca火花和BK通道设置的.

T Burdyga1, Susan Wray

  • 1Department of Physiology, The University of Liverpool, Liverpool L69 3BX, UK. burdyga@liv.ac.uk

Nature
|July 29, 2005
PubMed
概括

尿路光滑肌的耐火期由反机制控制. 这项研究揭示了sarcoplasmic网膜的加载和释放如何影响动作潜力的折射性,这对于预防尿液反流至关重要.

科学领域:

  • 生理学 生理学 生理学
  • 顺滑肌肉生物学 顺滑肌肉生物学
  • 信号传递 信号传递

背景情况:

  • 可兴奋组织中的耐火期可以防止过度活跃和.
  • 尿路光滑肌具有长时间的作用潜力和耐火期,可以防止尿液反流.
  • 光滑肌肉折射率的机制及其与兴奋能力的联系仍然不清楚.

研究的目的:

  • 阐明尿路平滑肌肉中耐火期背后的机制.
  • 了解细胞兴奋性和这种组织的折射性之间的关系.
  • 为了确定平滑肌肉病理的潜在治疗点.

主要方法:

  • 在sarcoplasmic网膜 (SR) 中研究了 (Ca2+) 动态.
  • 研究了自发Ca2+释放事件 (火花) 在SR负载中的作用.
  • 评估了对Ca2+敏感 (BK) 通道对动力潜力的折射性的影响.

主要成果:

  • 一个涉及SR Ca2+负载和火花激活BK通道的负反循环决定了耐火期.
  • 通过火花减少的SR Ca2+负荷结束了耐火期,允许随后的收缩.
  • 耐火期的持续时间可以通过改变SR Ca2+含量,释放机制或BK通道活性来改变.

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Preparation and Utilization of Freshly Isolated Human Detrusor Smooth Muscle Cells for Characterization of 9-Phenanthrol-Sensitive Cation Currents
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Preparation and Utilization of Freshly Isolated Human Detrusor Smooth Muscle Cells for Characterization of 9-Phenanthrol-Sensitive Cation Currents

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相关实验视频

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Focal Ca2+ Transient Detection in Smooth Muscle
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Bladder Smooth Muscle Strip Contractility as a Method to Evaluate Lower Urinary Tract Pharmacology
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Bladder Smooth Muscle Strip Contractility as a Method to Evaluate Lower Urinary Tract Pharmacology

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Preparation and Utilization of Freshly Isolated Human Detrusor Smooth Muscle Cells for Characterization of 9-Phenanthrol-Sensitive Cation Currents
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Preparation and Utilization of Freshly Isolated Human Detrusor Smooth Muscle Cells for Characterization of 9-Phenanthrol-Sensitive Cation Currents

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结论:

  • 尿路光滑肌的耐火期由一个Ca2+依赖的负反机制调节.
  • 这种机制将行动潜力的产生与SR Ca2+处理和BK通道活动联系起来.
  • 了解这些过程为开发治疗平滑肌疾病的治疗提供了基础.