active transport

简明释义

织运输

英英释义

例句

1.In cellular biology, active transport is crucial for moving ions against their concentration gradient.

在细胞生物学中，主动运输 对于逆浓度梯度移动离子至关重要。

2.Without active transport, cells would not be able to maintain their internal environment.

没有 主动运输，细胞将无法维持其内部环境。

3.The sodium-potassium pump is a classic example of active transport in animal cells.

钠钾泵是动物细胞中 主动运输 的经典例子。

4.During active transport, ATP is used to move substances across the cell membrane.

在 主动运输 过程中，ATP被用来推动物质穿过细胞膜。

5.Plants use active transport to absorb nutrients from the soil, ensuring they get the minerals they need.

植物利用 主动运输 从土壤中吸收养分，确保它们获得所需的矿物质。

作文

Active transport is a fundamental biological process that enables cells to move substances against their concentration gradient. This means that molecules are transported from an area of lower concentration to an area of higher concentration, which is contrary to the natural flow of diffusion. The significance of active transport (主动运输) cannot be overstated, as it plays a crucial role in maintaining cellular homeostasis and supporting various physiological functions.One of the most well-known examples of active transport (主动运输) is the sodium-potassium pump. This protein complex is found in the plasma membrane of cells and helps regulate the concentrations of sodium and potassium ions inside and outside the cell. By actively transporting three sodium ions out of the cell and two potassium ions into the cell, this pump helps maintain the necessary electrochemical gradient that is vital for nerve impulse transmission and muscle contraction.In plants, active transport (主动运输) is essential for nutrient uptake from the soil. Roots of plants utilize this process to absorb minerals such as potassium, nitrate, and phosphate, which are often present in low concentrations in the surrounding soil. Through the use of specific transport proteins, plants can actively take up these nutrients, ensuring that they have the necessary resources for growth and development. This process is particularly important during times of drought or nutrient deficiency when the availability of these minerals is limited.Another significant aspect of active transport (主动运输) is its role in the absorption of glucose in the intestines. The epithelial cells lining the intestinal wall utilize a mechanism known as secondary active transport to absorb glucose from the digestive tract. This process relies on the sodium gradient established by the sodium-potassium pump. As sodium ions flow back into the cell down their concentration gradient, they carry glucose molecules along with them against their own gradient. This efficient system ensures that the body can effectively absorb nutrients from the food we consume.Furthermore, active transport (主动运输) is also involved in the excretion of waste products from cells. For instance, cells may need to eliminate excess ions or toxins that could be harmful if allowed to accumulate. By utilizing active transport (主动运输), cells can expel these unwanted substances, maintaining a healthy internal environment.In summary, active transport (主动运输) is a vital process that underpins many cellular functions. It is essential for nutrient uptake, waste removal, and maintaining the proper ion balance within cells. Without active transport (主动运输), cells would be unable to function optimally, leading to detrimental effects on overall organism health. Understanding this process not only highlights the intricate workings of cellular biology but also emphasizes the importance of energy expenditure in maintaining life processes. As research continues to unveil the complexities of active transport (主动运输), it becomes increasingly clear that this mechanism is indispensable for the survival and functionality of all living organisms.

主动运输是一个基本的生物过程，使细胞能够将物质逆浓度梯度移动。这意味着分子从低浓度区域运输到高浓度区域，这与扩散的自然流动相反。主动运输（active transport）的重要性不容小觑，因为它在维持细胞内稳态和支持各种生理功能方面发挥着关键作用。最著名的主动运输（active transport）例子之一是钠钾泵。这个蛋白质复合物存在于细胞的质膜中，有助于调节细胞内外钠离子和钾离子的浓度。通过主动将三个钠离子排出细胞并将两个钾离子引入细胞，这个泵有助于维持必要的电化学梯度，这对神经冲动传导和肌肉收缩至关重要。在植物中，主动运输（active transport）对从土壤中吸收养分至关重要。植物的根部利用这一过程吸收土壤中的矿物质，如钾、硝酸盐和磷酸盐，这些矿物质在周围土壤中的浓度通常较低。通过使用特定的转运蛋白，植物可以主动吸收这些营养物质，确保它们拥有必要的生长和发育资源。在干旱或缺乏养分的情况下，这一过程尤为重要，因为这些矿物质的可用性有限。此外，主动运输（active transport）还涉及肠道对葡萄糖的吸收。肠道壁上的上皮细胞利用一种称为二次主动运输的机制从消化道吸收葡萄糖。该过程依赖于钠梯度，该梯度由钠钾泵建立。当钠离子沿其浓度梯度流回细胞时，它们会将葡萄糖分子一起带入细胞，尽管葡萄糖的浓度梯度是相反的。这一高效系统确保了身体能够有效地吸收我们所消费食物中的营养物质。此外，主动运输（active transport）还参与细胞废物的排泄。例如，细胞可能需要排除多余的离子或毒素，如果让其积累可能会造成危害。通过利用主动运输（active transport），细胞可以排出这些不需要的物质，维持健康的内部环境。总之，主动运输（active transport）是支撑许多细胞功能的重要过程。它对养分的摄取、废物的排除以及维持细胞内适当的离子平衡至关重要。如果没有主动运输（active transport），细胞将无法正常运作，从而对整体生物体的健康产生不利影响。理解这一过程不仅突显了细胞生物学的复杂运行，还强调了能量消耗在维持生命过程中所扮演的重要角色。随着研究不断揭示主动运输（active transport）的复杂性，越来越清楚这一机制对于所有生物体的生存和功能是不可或缺的。