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相关概念视频

Action Potentials01:41

Action Potentials

131.5K
Overview
131.5K
Action Potential01:31

Action Potential

8.0K
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...
8.0K
Action Potential: Phases of Stimulation01:28

Action Potential: Phases of Stimulation

6.1K
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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Generation of Action Potential in Skeletal Muscles01:24

Generation of Action Potential in Skeletal Muscles

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Every cell in the body maintains a membrane potential due to an uneven distribution of positive and negative charges across its plasma membrane. The membrane potential is measured in millivolts and quantifies the difference in charge across the membrane.
Like neurons, muscle cells are also regarded as excitable due to their capacity to change in response to stimuli, primarily due to voltage-gated ion channels embedded in their plasma membranes, which get activated by alterations in the...
4.6K
Propagation of Action Potentials01:23

Propagation of Action Potentials

6.0K
The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
6.0K
Cardiac Action Potential01:30

Cardiac Action Potential

1.7K
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

Updated: Jul 24, 2025

Examining Monosynaptic Connections in Drosophila Using Tetrodotoxin Resistant Sodium Channels
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揭开金星陷的动作潜力

Rainer Hedrich1, Ines Kreuzer1

  • 1Molecular Plant Physiology and Biophysics, Julius-von-Sachs Institute for Biosciences, Biocenter, Würzburg University, Julius-von-Sachs-Platz 2, D-97082, Würzburg, Germany.

The New phytologist
|July 10, 2023
PubMed
概括
此摘要是机器生成的。

金星飞会产生快速的电信号 (动能),以捕捉猎物. 它独特的离子通道和使这种食肉植物成为肉食植物.

关键词:
行动潜力 行动潜力 行动潜力的信号传递.肉食植物 肉食植物狩猎周期 狩猎周期离子输送器 离子输送器

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Preparation of Drosophila Central Neurons for in situ Patch Clamping
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Electrophysiological Method for Whole-cell Voltage Clamp Recordings from Drosophila Photoreceptors
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科学领域:

  • 植物电生理学 植物电生理学
  • 肉食植物生物学 肉食植物生物学
  • 作用潜力的分子机制 作用潜力

背景情况:

  • 植物表现出电刺激性,但很少产生明显的动作潜能 (AP).
  • 金星 (Dionaea muscipula) 以其快速的APs而闻名,这对于捕捉猎物至关重要.
  • 在Dionaea的AP是其狩猎周期的组成部分,AP的数量影响捕获决策.

研究的目的:

  • 为了研究金星的动作潜力的电生理学特性.
  • 了解Dionaea中的快速和高频APs的分子基础.
  • 为了阐明离子通道,和载体,负责金星飞AP的每个阶段.

主要方法:

  • 电生理学记录以表征动力潜能.
  • 在植物成熟和刺激性期间分析离子通道,和载体表达.
  • 研究特定分子组件在AP生成和传播中的作用.

主要成果:

  • 肌肉的Dionaea表现出高频率和速度的作用潜力,促进快速捕获猎物.
  • 在Dionaea的原型AP持续1秒,包括五个不同的阶段:静止状态,Ca2+短暂,脱极化,再极化和超极化.
  • 一组特定的离子通道,和载体在植物成熟时表达出来,每个组件都调节了AP的不同阶段.

结论:

  • 金星的独特电生理学是其食肉功能的关键.
  • 了解Dionaea的AP中的分子参与者,可以深入了解植物电信号.
  • 这项研究突出了植物快速电信号的基础上复杂的离子运输机制.