Muscular System, Sliding Filament Theory (1)

Muscular System, Sliding Filament Theory (1)



skeletal muscles like the biceps brachii attach to bone via connective tissue called tendons muscles are composed of bundles of muscle fibers each bundle is separated by connective tissues known as Paramecium each fasciculus is made up of muscle fibers which are separated by connective tissue called endomysium skeletal muscle fibers or cells are multinucleated and striated in appearance muscle cells are composed of subunits called myofibrils each myofibril is made up of several mile Philemon's the two types of myofilaments shown in red are composed primarily of the protein myosin and a thin mile filament shown in blue composed mainly of the protein actin the repeating arrangement of thick and thin myofilaments serves as the fundamental subunit of striated muscle contraction these subunits are called sarcomeres a sarcomere contraction is represented by the shortening of the distance between the Z lines the sarcomere shortens because the thin filaments slide past the thick filaments in 3d each thick mile filament is surrounded by six thin myofilaments arranged in a hexagonal pattern the 3d arrangement of sliding myofilaments is the microscopic basis of muscle contraction

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  1. Shout OUT to Mr. Moore's summer Anatomy crash course 2018. Are we having fun yet? LOL  here  is another (and amusing) video to learn Sliding Filament Theory from: https://www.youtube.com/watch?v=Ktv-CaOt6UQ

  2. Hey guys, this is a fastpaced video. I transcribed it for study. Here is the transcript text. I didn't take the time to correct any spelling though. Here goes: Skeletal muscles like the bicep brachii attach to bone via connective tissues called tendons.
    Muscles are composed of bundles of muscle fibers. Each bundle is separated by connective tissues
    called paramysieum. Each vesciculas is made up of muscle fibers which are separated by connective
    tissue called endomiseum. Skeletal muscles fibers and cells are multinucleated and striated in
    appearance. Muscles cells are composed of sub-units called myofibrals. Each myofibral is made up of
    several myofilaments. The 2 types of myofilaments shown in red are composed primarily of the protein
    myocin and the thin myofilament shown in blue composed of the protein actin. The repeating arrangement
    of thick and thin myofilaments serves as the fundamental subunit of striated muscle contraction.
    These subunits are called sarcomeres. A sarcomere contraction is represented by the shortening of
    the distance between the Zlines. The sarcomere shortens because the thin filaments slide past the
    thick filaments. In 3D each thick myofilament is surrounded by 6 thin myofilaments arranged in a
    hexagonal pattern. the 3D arrangement of sliding myofilaments is the microscopic basis of muscle contraction.

  3. Thank you. I still find it weird that this is still just a 'theory'. You would think that with the technology we have now, this would either be a fact or disproven.

  4. Yo yo… Fine vid clip.

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  5. Mad ups for replying to this, but I was still in high school when I posted this. I didn't even know about acetylcholine. At the time I thought the body just sort of shat out a bunch of Ca^(-2) Ions all over the filaments.

  6. Great animation thank you!!! But just to let you know at the beginning you said "muscles are composed of bundles of 'muscle fibers' but it's actually composed of Fascicles, if you are really saying it in order from outside to inner muscle.

  7. If you want to gain some muscle, you should definitely Google search for "Oak Muscle Method". You are sure to get the body you want.

  8. Actin and Myosin are wrongly labelled in this video -_-
    He says blue ones are actin, when the diagram shows the blue one as myosin :S. The right answer however, is that the blue ones are actin because they are the ones connected to Z lines.

  9. If I had just watched this a few days ago… I would've done better on my pop quiz! Good thing it wasn't graded haha, thanks for this video.

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