Mitochondria. When a muscle contracts, the actin is pulled along myosin toward the center of the sarcomere until the actin and myosin filaments are completely overlapped. Irwin McLean, University of Dundee, Scotland. - Definition, Types & Examples, What is Negative Feedback in Biology? Each muscle fiber contains hundreds of organelles called myofibrils.Each myofibril is made up of two types of protein filaments: actin filaments, which are thinner, and myosin filaments, which are thicker. What is what? Above is a diagram of how muscles in the human body are comprised of muscle cells. They have roles in cell movement, muscle contraction, and cell division. An intermediate filament is categorized based on its amino acids and protein structure. The muscle cells are made of stacks of microfilaments and myosin. General Biology, 11th Edition. CallUrl('www>fact-index>com
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