membrane potential

简明释义

膜电位

英英释义

例句

1.The neuron generates an action potential when the membrane potential (膜电位) reaches a threshold.

当神经元的膜电位（膜电位）达到阈值时，它会产生动作电位。

2.Changes in membrane potential (膜电位) can lead to muscle contractions.

在肌肉收缩中，膜电位（膜电位）的变化可以导致肌肉收缩。

3.Researchers measure the membrane potential (膜电位) to understand cellular responses.

研究人员测量膜电位（膜电位）以理解细胞反应。

4.The resting membrane potential (膜电位) of a typical cell is about -70 mV.

典型细胞的静息膜电位（膜电位）约为-70毫伏。

5.During depolarization, the membrane potential (膜电位) becomes less negative.

在去极化过程中，膜电位（膜电位）变得不那么负。

作文

The concept of membrane potential is fundamental in the field of biology, particularly in understanding how cells communicate and function. At its core, membrane potential refers to the difference in electric charge across a cell's plasma membrane. This difference arises due to the uneven distribution of ions, such as sodium, potassium, calcium, and chloride, inside and outside the cell. The maintenance of membrane potential is crucial for various cellular processes, including signal transmission in neurons, muscle contraction, and the regulation of cellular activities.To delve deeper into the significance of membrane potential, it is essential to explore how it is established and maintained. The cell membrane is selectively permeable, allowing certain ions to pass through while restricting others. The sodium-potassium pump plays a vital role in this process by actively transporting sodium ions out of the cell and potassium ions into the cell. This action creates a concentration gradient that contributes to the overall membrane potential. Typically, the inside of the cell is more negatively charged compared to the outside, resulting in a resting membrane potential of approximately -70 millivolts in many neurons.The changes in membrane potential are crucial for the generation of action potentials, which are rapid changes in the electrical state of the cell membrane. When a neuron is stimulated, ion channels open, allowing sodium ions to rush into the cell, leading to depolarization. This change in membrane potential triggers a cascade of events that ultimately results in the transmission of an electrical signal along the neuron. Understanding this process is essential for comprehending how information is processed in the nervous system.Moreover, membrane potential is not only important in neurons but also in muscle cells. In cardiac muscle, for example, the rhythmic contractions are initiated by changes in membrane potential that lead to the coordinated contraction of heart muscles. Any disruption in the normal membrane potential can lead to serious health issues, such as arrhythmias or muscle weakness.In summary, the concept of membrane potential is integral to our understanding of cellular physiology. It serves as the basis for many vital processes that occur within living organisms. By studying membrane potential, researchers can gain insights into the mechanisms of disease, develop new therapeutic strategies, and advance our knowledge of how life functions at the cellular level. As we continue to explore the complexities of biological systems, the importance of membrane potential will undoubtedly remain a key area of focus in both research and education.

膜电位的概念在生物学领域中是基础，特别是在理解细胞如何交流和功能方面。膜电位指的是细胞质膜两侧电荷的差异。这种差异是由于细胞内外离子（如钠、钾、钙和氯）分布不均匀而产生的。膜电位的维持对各种细胞过程至关重要，包括神经元的信号传递、肌肉收缩和细胞活动的调节。为了更深入地了解膜电位的重要性，有必要探讨它是如何建立和维持的。细胞膜是选择性渗透的，允许某些离子通过，同时限制其他离子的进入。钠钾泵在这个过程中起着重要作用，它通过主动将钠离子排出细胞并将钾离子输送入细胞来维持膜电位。这一过程创造了一个浓度梯度，为膜电位的形成做出了贡献。通常情况下，细胞内部的电荷相对于外部来说更为负，因此许多神经元的静息膜电位约为-70毫伏。膜电位的变化对动作电位的生成至关重要，动作电位是细胞膜电状态的快速变化。当神经元受到刺激时，离子通道打开，钠离子迅速涌入细胞，导致去极化。这种膜电位的变化触发了一系列事件，最终导致电信号沿着神经元的传递。理解这一过程对于理解信息在神经系统中的处理至关重要。此外，膜电位不仅在神经元中重要，在肌肉细胞中同样如此。例如，在心脏肌肉中，膜电位的变化引发了有节律的收缩，导致心肌协调收缩。膜电位的任何异常都可能导致严重的健康问题，例如心律失常或肌肉无力。总之，膜电位的概念是我们理解细胞生理学的基础。它是许多生命体内发生的重要过程的基础。通过研究膜电位，研究人员可以深入了解疾病机制，开发新的治疗策略，并推动我们对生命在细胞层面上如何运作的认识。随着我们继续探索生物系统的复杂性，膜电位的重要性无疑将继续成为研究和教育的重点领域。