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The sliding filament theory is a sequence of events that happens when skeletal m
The sliding filament theory is a sequence of events that happens when skeletal muscles contract. This happens by allowing contractile proteins to bind and slide over each other.
Discuss the different components of the sarcomere, how they are arranged.
The sarcomere is made up of several components which include protein filaments, bands, and lines. The protein filaments are both actin and myosin, which allow for muscle contraction. For the bands, there is the A-band which is from the beginning to the end of one thick filament. This creates a dark band. The I-band is from the end to the beginning of the next filament. This creates the light band. The H-zone is from the end of one thin filament to the beginning of the next filament. The sarcomere also contains lines which are the m-lines found at the center of the thick filament and provide an anchor for the thick filament. Also, the z-disc line provides anchorage for actin and titan filaments.
What changes (if any) happen to them when the muscle is contacted.
The sarcomere shortens. The filaments of actin and myosin slide over one another. Also, the I-band and H-zone shorten.
Also, think a little outside of the box. What do you think could disrupt these contractions?
The muscle contractions can be disrupted if there is an absence of calcium, which would cause the troponin and tropomyosin to move and block the actin-covering myosin binding site.
References
Saladin, K. S. (2020). Anatomy & Physiology: The Unity of Form and Function (9th ed.). McGraw-Hill Higher Education (US). https://ambassadored.vitalsource.com/books/9781260791563.
Smith, D. A. (2018). The sliding-filament theory of muscle contraction. Switzerland: Springer International Publishing.
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