calcium ion

简明释义

钙离子;

英英释义

例句

1.A deficiency in calcium ion 钙离子 can lead to osteoporosis.

缺乏钙离子可能导致骨质疏松。

2.The release of calcium ion 钙离子 in the muscle cells is crucial for contraction.

肌肉细胞中钙离子的释放对收缩至关重要。

3.In neurons, the influx of calcium ion 钙离子 triggers neurotransmitter release.

在神经元中，钙离子的流入触发神经递质的释放。

4.Certain medications can affect the flow of calcium ion 钙离子 in the body.

某些药物可以影响体内钙离子的流动。

5.The heart relies on calcium ion 钙离子 for proper electrical signaling.

心脏依赖于钙离子进行适当的电信号传导。

作文

Calcium plays a crucial role in the human body, and one of its most important forms is the calcium ion. The calcium ion (Ca²⁺) is an essential mineral that contributes to various physiological processes. It is vital for maintaining bone health, as it provides strength and structure to bones and teeth. In fact, about 99% of the body's calcium is stored in the bones. However, the remaining 1% is found in the blood and soft tissues, where the calcium ion performs numerous critical functions.One of the primary roles of the calcium ion is in muscle contraction. When a nerve impulse stimulates a muscle, calcium ions are released from the sarcoplasmic reticulum into the muscle cells. This influx of calcium ions triggers a series of reactions that ultimately lead to muscle contraction. Without adequate levels of calcium ions, our muscles would not function properly, leading to weakness or cramps.Moreover, the calcium ion is essential for neurotransmitter release in the nervous system. When a nerve cell is activated, calcium ions flow into the cell, facilitating the release of neurotransmitters that transmit signals between neurons. This process is fundamental for communication within the nervous system and affects everything from reflexes to mood regulation.In addition to its roles in muscles and nerves, the calcium ion also plays a significant part in blood coagulation. When there is an injury to a blood vessel, calcium ions are necessary for the activation of certain proteins that help form a clot. This process is crucial for preventing excessive bleeding and ensuring proper wound healing.The body regulates the levels of calcium ions through a complex interaction between hormones and dietary intake. Parathyroid hormone (PTH) and calcitonin are two hormones that help maintain calcium homeostasis. PTH increases the concentration of calcium ions in the blood by promoting the release of calcium from bones and enhancing absorption in the intestines. Conversely, calcitonin lowers blood calcium levels by inhibiting bone resorption and increasing calcium excretion in the kidneys.Dietary sources of calcium include dairy products, leafy green vegetables, nuts, and fortified foods. It is essential to consume adequate amounts of calcium to ensure that the body has enough calcium ions for its various functions. Insufficient calcium intake can lead to health issues such as osteoporosis, where bones become weak and fragile, increasing the risk of fractures.In conclusion, the calcium ion is a vital component of our biological systems, influencing muscle function, nerve transmission, and blood clotting. Understanding the importance of calcium ions can help us appreciate the need for a balanced diet rich in calcium to support overall health. By ensuring that we meet our calcium needs, we can promote strong bones, effective muscle performance, and a well-functioning nervous system, ultimately contributing to our quality of life.

钙在人体中扮演着至关重要的角色，其中最重要的形式之一就是钙离子。钙离子（Ca²⁺）是一种必需矿物质，参与多种生理过程。它对于维持骨骼健康至关重要，因为它为骨骼和牙齿提供强度和结构。事实上，约99%的体内钙储存在骨骼中。然而，剩下的1%则存在于血液和软组织中，在这里，钙离子执行着许多关键功能。钙离子的主要作用之一是肌肉收缩。当神经冲动刺激肌肉时，钙离子从肌浆网释放到肌肉细胞中。这种钙离子的涌入触发了一系列反应，最终导致肌肉收缩。如果钙离子水平不足，我们的肌肉将无法正常运作，导致无力或抽筋。此外，钙离子在神经系统中的神经递质释放中也至关重要。当神经细胞被激活时，钙离子流入细胞，促进神经递质的释放，从而在神经元之间传递信号。这一过程对于神经系统内部的沟通至关重要，影响从反射到情绪调节的方方面面。除了在肌肉和神经中的作用外，钙离子在血液凝固中也发挥着重要作用。当血管受伤时，钙离子对于激活某些有助于形成血块的蛋白质是必需的。这个过程对于防止过度出血和确保适当的伤口愈合至关重要。身体通过激素和饮食摄入之间的复杂相互作用来调节钙离子的水平。甲状旁腺激素（PTH）和降钙素是两种帮助维持钙稳态的激素。PTH通过促进骨骼释放钙并增强肠道吸收来增加血液中的钙离子浓度。相反，降钙素通过抑制骨吸收和增加肾脏中的钙排泄来降低血钙水平。膳食钙的来源包括乳制品、绿叶蔬菜、坚果和强化食品。摄入足够的钙对于确保身体拥有足够的钙离子以执行各种功能至关重要。钙摄入不足可能导致健康问题，如骨质疏松症，骨骼变得脆弱，增加骨折风险。总之，钙离子是我们生物系统的重要组成部分，影响肌肉功能、神经传导和血液凝固。理解钙离子的重要性可以帮助我们认识到均衡饮食中丰富钙的必要性，以支持整体健康。通过确保满足我们的钙需求，我们可以促进强健的骨骼、有效的肌肉表现和良好的神经系统功能，从而最终提升我们的生活质量。