血液-大脑屏障（Blood-Brain Barrier）是一种生理结构，它阻止了某些物质从血液进入大脑，从而保护大脑免受外来物质的损害。
以下是一篇关于血液-大脑屏障的英文范文：
Title: The Blood-Brain Barrier: Protecting the Brain from Foreign Agents
The blood-brain barrier (BBB) is a unique physiological structure that prevents certain substances from entering the brain from the bloodstream. This unique barrier, which is formed by specialized cells called endothelial cells, plays a crucial role in protecting the brain from harmful substances and foreign agents.
The BBB is made up of tight junctions between endothelial cells, which restrict the passage of molecules between the blood and the brain. Additionally, the BBB is equipped with transport systems that selectively transport substances across the barrier based on their size, charge, and other properties. These transport systems ensure that only necessary substances are allowed to enter the brain, while preventing harmful substances from reaching the brain tissue.
The blood-brain barrier plays an important role in maintaining the health of the central nervous system. It prevents the entry of viruses, bacteria, and other foreign agents that could cause brain infections or neurodegenerative diseases. Additionally, the BBB helps regulate the levels of nutrients and oxygen in the brain, ensuring that brain cells receive the necessary amounts of these essential substances.
Despite its protective role, the BBB can be disrupted under certain conditions, such as neurodegenerative diseases, stroke, and brain tumors. Understanding the mechanisms that regulate the BBB and how it can be disrupted can lead to new therapeutic strategies for treating brain diseases and disorders.
以上就是一篇关于血液-大脑屏障的英文范文，它详细介绍了这一生理结构的保护作用以及在病理情况下的可能变化。
血液-大脑屏障（Blood-brain barrier）是指存在于哺乳动物血液和脑组织之间的一种特殊的细胞结构与分子间的相互作用，它阻止了血液中物质进入脑组织，从而保证了脑组织的稳定。
在英文范文里，血液-大脑屏障相关的内容可能会涉及到相关的医学研究和实验，以及其在神经系统疾病治疗和预防中的应用。例如，在以下的文章中，就提到了血液-大脑屏障在阿尔茨海默病治疗中的潜在作用：
“近年来，血液-大脑屏障的调节在阿尔茨海默病治疗中受到了越来越多的关注。尽管现有的阿尔茨海默病治疗方法主要集中在阻止β-淀粉样蛋白的神经毒性，但血液-大脑屏障的调节可能为治疗阿尔茨海默病开辟新的途径。研究表明，通过调节血液-大脑屏障的功能，可以减少β-淀粉样蛋白的渗漏，从而减少神经元的丢失。因此，未来的研究应该集中在开发新的药物，以调节血液-大脑屏障的功能，以改善阿尔茨海默病患者的症状。”
如果你需要更多与blood brain barrier相关的英文范文信息，可以到相关学术期刊和论文中寻找，那里有最新的研究成果和前沿动态。
blood brain barrier的意思是血液-大脑屏障。
在英文范文中的用法变化为：它主要用来指代一种生理现象，即大脑血管中的血浆成分，不能自由进入大脑组织，从而在脑组织和血液之间形成了一个屏障。