Электрический орган

Для дальнейшего развития исследований ацетилхолина и механизмов его высвобождения следовало подобрать ткань более удобную для экспериментов, чем мозг грызунов. В мозговой ткани лишь малая часть нервных окончаний относится к холинергическим. Более гомогенный материал в принципе можно было бы получить из областей контакта между нервами и мышечными клетками, так как все мотонейроны имеют холинер- гические синапсы. Однако от всей массы мышечного волокна нервные окончания в таких контактах составляют очень небольшую долю.

И тут оказалось, что прекрасным источником материала для изучения холинергической синаптической передачи может быть электрический скат Torpedo. У каждой особи имеется па

ра специализированных органов, называемых электрическими, способных генерировать кратковременные электрические разряды, которыми рыба пользуется для парализации добычи и для зашиты.

Электрический орган хорошо подходит для экспериментов с ацетилхо- лином, поскольку в нем сосредоточено огромное количество синапсов, которые, как показали в 1940 г. А. Фес- сард, В. Фельдберг и Д. Нахманзон, работавшие на морской биологической станции в Аркашоне (Франция), являются холинергическими. Электрический орган, по существу, представляет собой специфически измененнную нервно-мышечную систему, и механизм передачи нервного импульса в нем во многом такой же, как в обычной системе. К примеру, в электрическом органе тоже регистрируются миниатюрные и субминцатюрные потенциалы концевой пластинки. Вместе с тем экспериментальные препараты, полученные из электрического органа, не содержат ни усложняющих исследование сократительных структур, характерных для мышечных клеток, ни сложных нейронных цепей и гетерогенного набора нейромедиаторов, которые свойственны центральной нервной системе.



  1. I simply want to say I am just very new to blogs and honestly savored this web-site. Most likely I’m planning to bookmark your blog post . You amazingly have tremendous stories. Thanks a bunch for sharing with us your blog.

  2. excellent points altogether, you simply won a new reader. What might you recommend in regards to your submit that you simply made a few days in the past? Any positive?

  3. I absolutely love your blog and find a lot of your post’s to be exactly I’m looking for. Does one offer guest writers to write content available for you? I wouldn’t mind creating a post or elaborating on most of the subjects you write related to here. Again, awesome blog!

  4. My brother recommended I might like this blog. He was totally right. This post actually made my day. You cann’t imagine just how much time I had spent for this information! Thanks!

  5. Nice post. I was checking continuously this blog and I am impressed! Extremely helpful info specifically the last part :) I care for such information a lot. I was looking for this certain information for a long time. Thank you and good luck.

  6. You completed several good points there. I did a search on the matter and found nearly all people will have the same opinion with your blog.

  7. I love the efforts you have put in this, appreciate it for all the great articles.

  8. Good – I should definitely pronounce, impressed with your site. I had no trouble navigating through all tabs as well as related info ended up being truly simple to do to access. I recently found what I hoped for before you know it in the least. Quite unusual. Is likely to appreciate it for those who add forums or something, website theme . a tones way for your customer to communicate. Excellent task.

  9. Normally I do not read article on blogs, however I wish to say that this write-up very forced me to check out and do so! Your writing style has been amazed me. Thank you, quite great post.

  10. I’m not sure where you’re getting your information, but great topic. I needs to spend some time learning much more or understanding more. Thanks for magnificent information I was looking for this info for my mission.

  11. you are actually a excellent webmaster. The website loading pace is incredible. It sort of feels that you’re doing any distinctive trick. In addition, The contents are masterpiece. you have done a magnificent task on this matter!

  12. Internet is considered to be an amalgamation and combination multifarious actions and uses. It provides loads of opportunities to large a section of people, can make a living easy for you to some great point. Everything on internet seems so systematic and sophisticated, which one might mere wonder about the functioning of the web that will happen. Students search this can courses, businessmen look for their own clients, and chatters look for some new friends. Offer how everything is on place.»My day job put me in the trail of a mystery book around August of 2007. That book was Twilight. I’d never heard about it or anything about, so I turned it over and checked out the back. «Vampires!» I thought, «Cool!» I chose to give it a shot and Applied hooked directly. I read all three books inside a week, which is much reading pertaining to who doesn’t read quite a bit.If you wouldn’t like an annual Gold membership you pay back monthly or quarterly. To a monthly membership you will probably pay $7.99 30 days which is close to twice almost the annual fee. An every three months (every 3 months) membership is $19.99, less costly than the monthly ladies expensive compared with annual payment.What: Join the final installment of the Tom’s of Maine «Wicked Fresh! Wednesdays» live video chat series with Karen Stewart and Howard Brown, founders and designers from the pioneering sustainable clothing line Stewart+Brown. Get the insider fashion scoop relating to fall fashion tips, balancing entrepreneurism with family, the way that they source their fabrics and more often. The Wicked Uncured! chat series is open towards the public and questions for Stewart+Brown are accepted in order to and inside chat session on Facebook via the Tom’s of Maine Wall or Live Chat tabs. Two chat participants will find a $250 gift certificate to Stewart+Brown for some eco chic fashions for fall!Amazon even updated its Kindle Fire HD 7-inch a bit as very well. The Kindle Fire HD 2 can have a front-facing camera and a microphone. It is $139 a good 8-gig version and $169 for a 16-gig version, which can be a pretty significant price take.No appear your age, height, weight or physical appearance, there are thousands of women out there eager meet up with you and eager for firm.whether short-term or long-term relationships are as a precaution want. If you have found yourself suddenly «on-the-market» again after a romantic relationship has dissolved or are merely too busy with your work to spend a involving time looking for a lady to a person company, internet dating can open the door to the dating scene for you have to.There is really a good news for fans of the TNT indicate. The Atlanta based cable network has ordered the series back much more season courtroom shenanigans. TNT announced late last month that the legal drama would return for 2nd season. Tonight fans can have a for you to chat the new portrayers in the spontaneous legal duos. Following your season finale on TNT, Mark-Paul Gosselaar and Breckin Meyer will participate within a live free sex at tnt.tv/chat. Fans interested in participating can submit their questions via the «Franklin & Bash» Facebook pageor Twitter using the hash tags #FandB.How about Andrew? Would Andrew because the one to possess shot Robert? He told Lynette that he was ready to do whatever it popularized protect his mother from living virtually a bunch of ex-convicts. Lynette reminded Andrew he any pretty rotten guy as he was an adolescent. Was any signal that Andrew may well taken can buy his mom’s guns and shot Paul that night after the riot?Wireless technology allows the Mac-ophile listen to their computer’s iTunes library from any room each morning house, utilizing Apple Airport Express with Air Melodies. It is works with both Windows and Mac OS X.I experienced great success with each of these methods, both on short and long trips out your front door. Be creative and try out a few different options observe what works well with you. Safe travels!

  13. Do you mind if I quote a couple of your posts as long as I provide credit and sources back to your blog? My blog is in the exact same niche as yours and my visitors would really benefit from some of the information you present here. Please let me know if this ok with you. Thanks!

  14. I have been browsing online greater than three hours these days, but I never discovered any interesting article like yours. It is beautiful worth enough for me. In my opinion, if all site owners and bloggers made just right content material as you did, the web will probably be much more useful than ever before.

  15. I really like your writing style, excellent info, thanks for posting :D . «Kennedy cooked the soup that Johnson had to eat.» by Konrad Adenauer.

Оставить коментарий