Author: Freesciencelessons via YouTube
Go to Source

In this video, we take a close look at the structure of skeletal muscle. We explore the structure of muscle fibres. This includes the structure of the myofibrils and the arrangement of myosin and actin. We then look at how the banding pattern in the muscle fibre changes when muscles contract and explain this in terms of the arrangement of the thick and thin filaments.

Image credits:

Types of Muscle
https://commons.wikimedia.org/wiki/File:Types_Of_Muscle.jpg
www.scientificanimations.com, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons

Myofibril
https://commons.wikimedia.org/wiki/File:Figure_38_04_03.jpg
CNX OpenStax, CC BY 4.0 https://creativecommons.org/licenses/by/4.0, via Wikimedia Commons

Skeletal muscle fibres
https://commons.wikimedia.org/wiki/File:Muskel_(_1).jpg
Rollroboter, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons

TEM of muscle tissue
https://commons.wikimedia.org/wiki/File:Human_skeletal_muscle_tissue_1_-_TEM.jpg
Louisa Howard, Public domain, via Wikimedia Commons

Muscle fibres (adapted by S. Donnelly with thanks to the creators OpenStax)
https://commons.wikimedia.org/wiki/File:1022_Muscle_Fibers_(small).jpg
OpenStax, CC BY 4.0 https://creativecommons.org/licenses/by/4.0, via Wikimedia Commons

Myosin
https://commons.wikimedia.org/wiki/File:Rheumatology_-_Myosin_4_–_Smart-Servier.png
Laboratoires Servier, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons

Actin
https://commons.wikimedia.org/wiki/File:Actin_strand.png
Boumphreyfr, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons

Go to Source