Talk:Myofibril

The function of myofibrils

what does a myofibril do? -72.40.25.206

Contract. →Raul654 04:21, 4 October 2005 (UTC)

Perhaps we should discuss more of the function on the page... *shrugs*

What picture?

"The photo below is a high power picture (electron micrograph) of a small region of a skeletal muscle cell."

What picture exactly is this part of the article referring to? If it remains absent I'm going to remove this reference, as the description is useless without a picture. --Tyciol 06:20, 31 January 2006 (UTC)

I think its about time that paragraph got taken out. A few searches on google doesn't turn up any EMs of sarcomeres (that aren't copyrighted), and regardless, I think the whole paragraph on sarcomeres is better left for the page for sarcomeres. The only bands I could imagine being relevant to a page on myofibrils are the H-band (which is difficult to see at the sarcomere level) and the Z-band to which the actin filament is attached to. -- Ricardolugo 19:51, 9 Feb 2006 (UTC)

Good, a second :) Man... I tell you this area of biology is really cool, because I have a large interest in knowing how far (as opposed to how hard) a muscle can contract, which is integral in the realm of active stretching which I'm currently trying to comprehend better. I'm starting to think that in the case of ballet dancers who are able to hold an active side splits that they use momentum or lifting to get the limb up there, and that rather than the muscle holding it there, it's just a complete lack of stretch reflex, and the limb simply doesn't fall because of gravity... ie, it's harder to hold an active 170 than 180 if my theory holds true. Tyciol 05:32, 13 February 2006 (UTC)

Concentric and eccentric action explanations

I attempted to explain the difference here, could someone go further into what we know about the difference in how the forces at action in contraction work during an eccentric movement? The heads don't move together, yet there is a force attempting to do so, right? Dictabeard (talk) 10:06, 28 January 2011 (UTC)

Actually, they're already dealt with in Muscle_contraction#Contractions. Mokele (talk) 13:35, 28 January 2011 (UTC)

The cited reference is an atlas, which would typically only provide diagrams and pictures. A complete definition of myofibrils should include information about the physiology (the function), in addition to the structure. While the information provided in the article is accurate, I think it needs to be expanded to include recent research of the topic and a more comprehensive definition. SookiNJITWILL (talk) 04:13, 22 November 2012 (UTC)SookiNJITWILL

light miscroscopy

The following explanation is wrong: "These Z-discs are dense protein discs that do not easily allow the passage of light. The T-tubule is present in this area. The area between the Z-discs is further divided into two lighter colored bands at either end called the I-bands, and a darker, grayish band in the middle called the A band.

The I bands appear lighter because these regions of the sarcomere mainly contain the thin actin filaments, whose smaller diameter allows the passage of light between them. The A band, on the other hand, contains mostly myosin filaments whose larger diameter restricts the passage of light. A stands for anisotropic and I for isotropic, referring to the optical properties of living muscle as demonstrated with polarized light microscopy."

This has nothing to do with light!!! All pictures about the sarcomere are made with electron microscopy... there is no possibility to observe proteins like actin with light microscopy.

Czecker (talk) 22:53, 13 January 2013 (UTC)

No, you can't see individual proteins, but the highly ordered structure of sarcomeres means you can use polarized light to see the regions described above. HCA (talk) 23:21, 14 January 2013 (UTC)

you're right. Accepted ;-)Czecker (talk) 03:58, 29 January 2015 (UTC)

External links modified (February 2018)

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Sarcostyle

Sarcostyle redirects here, but the word is not mentioned in the article. Is it just an old word for a Myofbril? Or a part of it? Would be great if somebody could add this. I came across the word in a text from the 1930ies and wonder what it is. Dietzel65 (talk) 17:27, 7 January 2021 (UTC)