Types of Myofilaments
There are three different types of myofilaments: thick, thin, and elastic filaments.
- Thick filaments consist primarily of the protein myosin. Each thick filament are approximately 15 nm in diameter, and each is made of several hundred molecules of myosin.
- Thin filaments, 7 nm in diameter, consist primarily of the protein actin. All thin filaments are attached the Z disc.
- Elastic filaments, 1 nm in diameter, are made of titin, a large springy protein. They flank each thick filament and anchor it to the Z disc, the end point of a sarcomere.
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“... there are two types of happiness and I have chosen that of the murderers. For I am happy. There was a time when I thought I had reached the limit of distress. Beyond that limit, there is a sterile and magnificent happiness.”
—Albert Camus (1913–1960)