The answers are:
1. During contraction, the myosin myofilaments shorten - true
2. During contraction, the actin myofilaments shorten - false
3. The sliding filament model explains how myofilaments slide past each other - true
4. The sliding of the myofilaments past each other cause the sarcomere to shorten - true
A family of motor proteins called myosins is well known for their functions in a variety of eukaryotic motility processes, including the contraction of muscles. They are ATP-dependent and in charge of motility based on actin.
Wilhelm Kühne made the initial discovery of myosin (M2) in 1864. In order to maintain the tension in the muscle, Kühne extracted a viscous protein from skeletal muscle. He gave the protein the name myosin. The word has been expanded to include a collection of connected ATPases that are present in the striated and smooth muscle tissue cells.
Numerous different myosin genes have been found since the identification of myosin-like enzymes in the eukaryotic kingdom Acanthamoeba castellanii in 1973.
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