Anatomy of a muscle cell
Video taken from the channel: Khan Academy
Muscle Fiber Contraction and Relaxation
Video taken from the channel: DeBacco University
Muscles, Part 1 Muscle Cells: Crash Course A&P #21
Video taken from the channel: CrashCourse
Chapter 9.4 Muscle Fiber Contraction BIO201
Video taken from the channel: WyzSci
Myology Skeletal Muscle Contraction
Video taken from the channel: Armando Hasudungan
The Mechanism of Muscle Contraction: Sarcomeres, Action Potential, and the Neuromuscular Junction
Video taken from the channel: Professor Dave Explains
Muscle Contraction Cross Bridge Cycle, Animation.
Video taken from the channel: Alila Medical Media
Muscle contraction occurs when a muscle fiber or group of fibers is signaled by the brain via nerves to activate and increase the tension within the muscle. It is also called muscle fiber activation. Your body has three different types of muscles and they contract in three different ways.
The muscular system works to control the movement of our body and internal organs. Muscle tissue contains something called muscle fibers. Muscle fibers consist of.So let’s do a quick review of muscle contraction physiology: An action potential in a motor neuron causes acetylcholine to release in the synaptic cleft. Acetylcholine binds with receptors on the cell membrane on the muscle fiber, opening Ca2+ -Na+ channels.
Usually referred to as Calcium channels.Share: CONTRACTION AND Peace On the Muscle FIBER Contraction and peace of your muscle mass fiber occurs during the heart during the course of pumping of blood towards entire body. The guts is sensitive organ while in the whole body that’s a fist size and weigh amongst 250 and 300grams.The heart is enclosed within a double walled sac known as pericardium outdoors, myocardium within the.Muscle contraction begins when the nervous system generates a signal.
The signal, an impulse called an action potential, travels through a type of nerve cell called a motor neuron. The neuromuscular junction is the name of the place where the motor neuron reaches a muscle cell. Skeletal muscle tissue is composed of cells called muscle fibers.A cross-bridge forms between actin and the myosin heads triggering contraction.
As long as Ca ++ ions remain in the sarcoplasm to bind to troponin, and as long as ATP is available, the muscle fiber will continue to shorten…
.
. Muscle contraction usually stops when signaling from the motor neuron ends, which repolarizes the sarcolemma and T-tubules, and closes the voltage-gated calcium.The theory of contraction called the Interdigitating Filament Model of Muscle Contraction, or the Sliding Filament Theory of Muscle Contraction, says that the myosin of the thick filaments combines with the actin of the thin filaments, forming actomyosin and prompting the filaments to slide past each other.During contraction, the thin filaments slide past the thick filaments, shortening the sarcomere.
This content is not compatible on this device. The thick and thin filaments do the actual work of a muscle, and the way they do this is pretty cool. Thick filaments are made of a protein called myosin.Recently, a number of experiments have shown how to use these building blocks to create filament-based artificial muscles that use the conversion of writhe to extension or contraction, exposing.The contraction of a striated muscle fiber occurs as the sarcomeres, linearly arranged within myofibrils, shorten as myosin heads pull on the actin filaments.
The region where thick and thin filaments overlap has a dense appearance, as there is little space between the filaments.A single motor neuron is able to innervate multiple muscle fibers, thereby causing the fibers to contract at the same time. Once innervated, the protein filaments within each skeletal muscle fiber slide past each other to produce a contraction, which is explained by the sliding filament theory.Muscle Contraction Steps in Detail A signal is sent from the brain or the spinal cord to the muscle via neurons An action potential is generated in the neuron, releasing Ca ++ in the neuromuscular junction The influx of caalcium ions causes acetylcholine (AcH) to be released in the synaptic cleft.Muscle contraction is the activation of tension-generating sites within muscle fibers.
In physiology, muscle contraction does not necessarily mean muscle shortening because muscle tension can be produced without changes in muscle length, such as when holding a heavy book or a dumbbell at the same position. The termination of muscle contraction is followed by muscle relaxation, which is a.Vertebrate muscles and tendons are derived from distinct embryonic origins yet they must interact in order to facilitate muscle contraction and body movements.
How robust muscle tendon junctions (MTJs) form to be able to withstand contraction forces is still not understood. Using techniques at a single cell resolution we reexamined the classical view of distinct identities for the tissues.A muscle fiber contains many myofibrils, which are cylinders of muscle proteins. These proteins allow a muscle cell to contract.
Myofibrils contain two types of filaments that run along the long axis of the fiber, and these filaments are arranged in hexagonal patterns. There are thick and thin filaments.
List of related literature:
|
|
| from Build Your Running Body: A Total-Body Fitness Plan for All Distance Runners, from Milers to Ultramarathoners—Run Farther, Faster, and Injury-Free |
|
|
|
| from Anatomy & Physiology E-Book |
|
|
|
| from An Introduction to Human Movement and Biomechanics E-Book |
|
|
|
| from Concise Textbook of Human Physiology |
|
|
|
| from Swimming Fastest |
|
|
|
| from Human Physiology: From Cells to Systems |
|
|
|
| from Essentials of Medical Physiology |
|
|
|
| from Snell’s Clinical Anatomy by Regions |
|
|
|
| from Berne and Levy Physiology E-Book |
|
|
|
| from Davidson’s Principles and Practice of Medicine E-Book |
68 comments
OMG!!! I get it now. Thats so awesome. Thank you soooo much!!
He: It is better to leave further topics for another day since it is really important to understand the basics first
Me: xxxx
this is certainly one of THEE MOST informative videos haha, i will need to watch it a few more times XD
Loved these videos-extremely helpful. The only thing that bothered me is that the plural of nucleus is nuclei; I cringed every time I heard ‘nucleuses’.
ur videos are so unique and so clear….ur making my neet exams concepts clearer..thanku
Take the hesi next month, just brushing up on some concepts ��.
Thank u so much ur videos are very helpful for us here in Algeria as medical students
So my muscles move like a caterpillar’s legs when it walks? I’m too high for this shit.
This 2 minute video did a better job than what my professor did in a hour
Have blown my mind! Literally, I have had spent a lot of time to understand this topic, but your explanation is AMAZING!
Thank you sir for helping a first year med student������
why am I learning this in 11th grade biology….everyone here is in med school wtf
Such a great video. Why can’t my teachers be so clear when they teach?
Thank you so much for this! Great animation, it certainly made it easier for me to understand.
2 hours of lecture, 1 hour of class asking questions, 1 hour of review next class… Students confused.
Watch this 12 minute video. Concepts understood.
I do understand that copyright is a problem, however can you please place your organizations name in the corner of the video. It is hard to see the terminology and pay attention to the content of the video with “Allia…” written on top of the animation.
Great video, but thumbs down for adding the annoying pop-ups that you have to change screen size to escape out of.
This makes like stil no fucking sense but i can tell this is a good video
The most confusing part is that it sounds like we should be consuming a thousand times more calcium than we do
Thank you for watching! Follow us on Twitter https://twitter.com/AlilaMedical for instant notification of our new videos!
“let the crawling begin!” lol i dunno why but this had me cracking up…
Wooow this is explained perfectly, i wish now my professor ask me this hahaha
This was nice and slow and very easy to understand. Thank you so much
Watching your videos is like learning is fun….LOVE The way u present Hank!!!!…thanks loads…keep up this great teaching…..
why is atp used during tetanus if the myosin heads can’t pull the actin in any further?
OMG!!!!,, This is the most outstanding teaching performance that I’ve ever witnessed in my entire Fucking life. thank you so much and you are a true hero indeed.
This was the amazing. I don’t often see videos that are are so easy to follow and simplify the complicated process as well as you did. Thank you.
thank you so much… reading the book i was going mad and this made it so easy for me to understand… ��
Very thorough video on muscle contraction though one crucial point is ignored. It’s how we achieve isometric or isotonic contraction.
It’s funny how many thousands of dollars I’m paying to get a piece of paper that says I learned all of this stuff. I come to your channel to genuinely understand this after PhDs being paid to teach it to me have throughly confused me, lol.
It is clearly the best and plain video about the muscle contraction mechanism, thanks for your huge work.
Do muscles push or pull at the micro level? Is there a push thus creating a pull or a pull thus creating a push?? If things are opening the micro level that would indicate a push motion starting the process of contraction.???
U havent talked about ATP? How many atp are used? Where atp are formed
Thank you so much…itz so helpful to understand very easily..����
Thank you for you amazing videos. I am also a teacher. What format/program are you using for these videos? Connie
Does anyone else know?
amazingly explained with lots n lots of efforts….thankyou so much
please put some videos related to cell cycle
Seriously such a helpful video! I appreciate your work so much and I know countless do as well!
CAN YOU PLEASE FIX YOUR HANDWRITING I AM TRYING TO GET MY WORK DONE!!!!
You are one amazing man for doing these types of videos! incredibly simple explanation and the way you combine it with a love story gives anyone who watches a better understanding as to what is going on in your muscles! We should just watch these videos for class!
thank you for these videos my classmates and i watch these in study group #teammedschool
i learned that….my profesor just said this is a mucle fyber
First semester at med school, lots of gratitude from Greece!
Why did I go to med school armando? The education system is so rigged, need to pay huge money and listen to shitheads for years to get a “degree”..
where are your references and studies you based on in your playlists…
This happened me so much understand the concept of muscle contractions!! life saver!!!
I can’t believe it I still watch this in 2020 thank you guys!
PROFESSOR DAVE sir you just saved my life. No amount of ‘thank you’s’ could amount to how grateful I am for your videos!!
Can you explain the mechanisms by which an increase in cytosolic Ca2+ concentration initiates contractile activity in skeletal muscle cells please
Awesome way and awesome photos to make us understand, it made me go throw this part in histology pretty well but only one thing is still unknown to me which is the site of the A-I junction.
Where is it exactly?
Loved this video!!! My professor is about teaching the “concept” but look at YouTube for lectures!! I don’t understand it either, but text books can be so dry with material and i am a visual learner, So THANK YOU for posting this!!! breaking it down the way you did really helped
This honestly saved my grades thankyouuuuuuu! my prof could never
Great video thank you so much to explain a very detail about muscle contraction
When the actin is at rest does it always carry the phosphate and ADP? When the cycle restarts, does new calcium come in or the same calcium stays attached?
Excellent video. Concept Very well explained with good drawings / diagrams. Much much easier than reading & understanding directly from the text. ��
Being able to visualize the process really helps a lot! If you could speak a tad slower would be helpful for me. Your hand is moving quickly as well as your speech, caused me to rewind a few times. Otherwise, the illustrations are wonderful and makes this a great tutorial.
I am a MMC Student…i am understand this concept very much… tq u for this video
But, how does this depolarization cause an action potential to develop
I watched this years ago in high school, I watched it again in medschool and now preparing for usmle I’m watching it again. Crash course is one of the best resources I’ve ever seen. ������ ��
is this a different mechanism compared to the calcium induced calcium release?
Professor, how to neutralize kerosene??
I mean, ” if we slowly drops pieces of zinc into nitric acid or aquaregia, it loses its reactivity slowly making lots of hiss sounds and then the acid is unreactive as water, even if we dip our fingers into such acid nothing happens..”
☝ Like ways, tell me something that kerosene/ petroleum is reactive with and make them loose their power.
i loved how he closed it, he knows im about to watch this 6 times…
Troponin:
1) binds to actin TnI
2) binds to tropomyosin TnT
3) binds to calcium TnC
Correct me if I’m wrong..
Nice explanation but..
It is sarcoplasmic reticulum not sacroplasmic.& many mistakes.
I appreciated the graphic and explanation about the impulse travelling along the sarcolemma and the T-tubules. That’s what I’ve been trying to grasp but none of the other videos I’ve watched explain it.
I wish I could like this video a million times. Thank you so much!
Love You.I don’t know how to thank you,i am electrical engineer pursuing my master thesis in prosthesis and my research on focused on using FSR Sensor instead of EMG..
A long time ago, when I was in the hell known as organic chemistry, I used to watch this guys videos. Now I’m watching his videos for the MCAT.
I love how this episode references Captain America: The First Avenger and Titanic, which are two of my favorite films. Yes, muscles do make me think of Chris Evans as Steve Rogers.
I really like what you did here! Very clean and easy explanation.
One minor faulty though: Sarcomere, not sacromere..
Keep up the good work!