🩸در اندام هایی که مویرگ های پیوسته دارند، مثل مغز، ورود و خروج مواد باید به شدت کنترل شود تا فقط مواد مورد نیاز وارد اندام شوند.
🫁🍫مثلا مغز به اکسیژن و گلوکز نیاز دارد.
🧠سلول های بافت پوششی مویرگ های مغز به یکدیگر چسبیده اند و بین آن ها منفذی وجود ندارد.در نتیجه، بسیاری ازمواد و میکروب ها در شرایط طبیعی نمی توانند به مغز وارد شوند.این عامل حفاظت کننده، سد خونی – مغزی نام دارد.
⭕البته مولکول هایی مثل اکسیژن ، گلوکز، آمینواسید ها و برخی داروها میتوانند از این سد عبور کنند و به مغز وارد شوند.
🩸در اندام هایی که مویرگ های پیوسته دارند، مثل مغز، ورود و خروج مواد باید به شدت کنترل شود تا فقط مواد مورد نیاز وارد اندام شوند.
🫁🍫مثلا مغز به اکسیژن و گلوکز نیاز دارد.
🧠سلول های بافت پوششی مویرگ های مغز به یکدیگر چسبیده اند و بین آن ها منفذی وجود ندارد.در نتیجه، بسیاری ازمواد و میکروب ها در شرایط طبیعی نمی توانند به مغز وارد شوند.این عامل حفاظت کننده، سد خونی – مغزی نام دارد.
⭕البته مولکول هایی مثل اکسیژن ، گلوکز، آمینواسید ها و برخی داروها میتوانند از این سد عبور کنند و به مغز وارد شوند.
What distinguishes the app from competitors is its use of what's known as channels: Public or private feeds of photos and videos that can be set up by one person or an organization. The channels have become popular with on-the-ground journalists, aid workers and Ukrainian President Volodymyr Zelenskyy, who broadcasts on a Telegram channel. The channels can be followed by an unlimited number of people. Unlike Facebook, Twitter and other popular social networks, there is no advertising on Telegram and the flow of information is not driven by an algorithm. If you initiate a Secret Chat, however, then these communications are end-to-end encrypted and are tied to the device you are using. That means it’s less convenient to access them across multiple platforms, but you are at far less risk of snooping. Back in the day, Secret Chats received some praise from the EFF, but the fact that its standard system isn’t as secure earned it some criticism. If you’re looking for something that is considered more reliable by privacy advocates, then Signal is the EFF’s preferred platform, although that too is not without some caveats. Overall, extreme levels of fear in the market seems to have morphed into something more resembling concern. For example, the Cboe Volatility Index fell from its 2022 peak of 36, which it hit Monday, to around 30 on Friday, a sign of easing tensions. Meanwhile, while the price of WTI crude oil slipped from Sunday’s multiyear high $130 of barrel to $109 a pop. Markets have been expecting heavy restrictions on Russian oil, some of which the U.S. has already imposed, and that would reduce the global supply and bring about even more burdensome inflation. "Markets were cheering this economic recovery and return to strong economic growth, but the cheers will turn to tears if the inflation outbreak pushes businesses and consumers to the brink of recession," he added. In view of this, the regulator has cautioned investors not to rely on such investment tips / advice received through social media platforms. It has also said investors should exercise utmost caution while taking investment decisions while dealing in the securities market.
from ms
