Neurons (or nerve cells) are specialized cells that transmit and receive electrical signals in the body. Neurons are composed of three main parts: dendrites, a cell body, and an axon. Signals are received through the dendrites, travel to the cell body, and continue down the axon until they reach the synapse (the communication point between two neurons). Created by Sal Khan.
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ocast evo sensory neurons can detect heat, pressure, light, etc. That causes signals to be sent to the Central Nervous System, ie your brain and spinal cord. many reflexes such as withdrawing your hand from a hot plate are processed in the spinal cord plexus and are not consciously voluntary. Your body can send a signal called an action potential to your muscles and cause them to contract and move in milliseconds!
It should be noted that upon talking about the anatomy, one should distinguish between the CNS (Central Nervous System) and the PNS (Peripheral Nervous System), since the CNS has the oligodendrocytes as an insulator wrapped around the axon, whereas the PNS has the Schwann cells. They both do more or less the same job, yet the structure is different. Of utmost importance is the fact that the Schwann cells are the only ones capable of axonal regeneration after damage in mammals, which explains why such process is only feasible on the PNS.
+SoulSpectrum You're very welcome dear :) Not really, yet I use a textbook that our lecturer has reccommended, which I find it quite helpful, since it breaks everything down for you. Nice and neat, it's Pinel's Biopsychology. Even if you're not in psychology you can always have your textbook & presentations as a guide and try to look for other sources as well. Never rely solely on youtube or the internet. They are fantastic and provide lots of information, still they're not holistic and there are always bits been left out or mispresented. To me it works as a little revision, I get a general picture in my head of what I've learnt.
schwann cells are adjacent to axons, they produce the myelin which covers the axons. um. i'm not sure if the schwann cell's membrane is the thing that covers the axon... and it contains myelin in it? i think it might be that. but the first sentence is 100% true though
A perfect story about neuron, I wish there is more videos with this subject. Another resource I also found useful for human anatomy body is Moorack Simple Anatomy Miracle - it will be on google if you need it.
"Anatomy of a neuron" imo is a too broad term to deal with. There is a variety of neurons in the different parts of the CNS and PNS with differing morphological characteristics. Nevertheless, a very good basic explanation.
What equipment do you use to make your videos? Here's his response:
I use Camtasia Recorder ($200) + SmoothDraw3(Free) + a Wacom Bamboo Tablet ($80) on a PC. I used to use ScreenVideoRecorder($20) and Microsoft Paint (Free).
I believe my Biology book is trying to make everything complicated, so the author can be seen as an intellectual. Students in introductory courses would learn much better with straight-forward teaching, like here. Thank you Salman!
(yes I know you wrote this three years ago, I apologize if your mind has been changed). I think there is an agenda in educational facilities that desires to weed out the 'lazy/unscientific' minded people from important credentials like a doctorate of ph.D.
But to be honest I think it's understandable as to why they do this. The population is growing rapidly, and there is more chance of scientific error if they just let any Tom Dick and Harry in any scientific field. BUT if you have a passion for what you're studying, then you'll work hard to understand what the textbook is implying in its material, it can be done!
Get dictionaries, search multiple sources, chat with others in your class... There is no reason why you can't work on digesting 'complicated' study material. One day you might even be one of those very people who help publish such textbooks!
I can't find the end of this video. I looked in the biology playlist and I couldn't find a continuation anywhere, though there is a private video there, could that be it? Is there anyone who has a link to the rest of the video?
Is this video continued somewhere, and is so can someone link it please. I cant find any myself. I missed some explanation of the difference between unipolar, pseudounipolar, bipolar and multipolar neurons. Great video though!
Wow. Superb vid.
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I love your videos! You have helped me I understand complex subjects. Please make more videos on anatomy & physiology of the human body & the pathophysiology of diseases!! I am a RN student in need to clarification. Thanks again for all your great video!!
This was a very helpful video, thank-you. Does anyone know if there is a video that explains the transmission of a nerve signal using a ion gradient? Preferably Khan because the video's are clear but I am open to anything :)
probably changes dramatical depending on the use of the nerve. those on the shoulders would need a lot more stimulation before doing any action, whereas those on the hands need very little. a nerve generally has a charge of -70 millivolts and can go up to +40 when an impulse is sent
im a complete layman when it comes to neuroscience or even cell biology (i have no formal education, didnt pass highschool lol) but all i want to know is, what physical properties determines how much input voltage turns the neuron "on". is it the ratio of positive ion gates, to negative ones? like, what sets the neuron's weight value?
Although foreigners may now invest in A-shares, there is a monthly 20 percent limit on repatriation of funds to foreign countries.
Performance of A-shares.
Since its inception in 1990, including a major reform in 2002, the index has seen great fluctuations. Overall, however, it has grown along with the Chinese economy. The years 2015 to 2016 were a particularly difficult period, with a 52-week performance of -21.55 percent as of July 20, 2016.
As China grows from an emerging market to an advanced economy, there is substantial demand for Chinese equity. Stock exchange regulators continue efforts to make A-shares more broadly available to foreign investors and have them recognized by the global investing community.
In June 2017, the MSCI Emerging Markets Index announced a long-awaited decision it would add stocks to its index. According to CNBC, MSCI will add 222 China A Large Cap stocks to its benchmark emerging markets index gradually beginning in 2018. The MSCI website reveals the stocks it will list include the Bank of China, China Merchants Bank, Guotai Junan, Ping An Insurance, according to a document on Tsingtao Brewery, SAIC Motor, Suning Commerce and Spring Airlines.
Current Dividend Preference.
Participating Preferred Stock.
Convertible Preferred Stock.
Cumulative preferred stock includes a provision that requires the company to pay preferred shareholders all dividends, including those that were omitted in the past, before the common shareholders are able to receive their dividend payments.
Non-cumulative preferred stock does not issue any omitted or unpaid dividends. If the company chooses not to pay dividends in any given year, the shareholders of the non-cumulative preferred stock have no right or power to claim such forgone dividends at any time in the future.
Participating preferred stock provides its shareholders with the right to be paid dividends in an amount equal to the generally specified rate of preferred dividends, plus an additional dividend based on a predetermined condition. This additional dividend is typically designed to be paid out only if the amount of dividends received by common shareholders is greater than a predetermined per-share amount. If the company is liquidated, participating preferred shareholders may also have the right to be paid back the purchasing price of the stock as well as a pro-rata share of remaining proceeds received by common shareholders.
Significance to Investors.