Striated muscle

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Striated Muscle

Striated muscle (pronunciation: /straɪˈeɪtɪd ˈmʌsəl/) is a type of muscle tissue that is marked by transverse dark and light bands, is made up of elongated, usually multinucleated fibers, and includes skeletal and cardiac muscle.

Etymology

The term "striated" is derived from the Latin word "stria" which means "groove" or "furrow". This refers to the visible striations or bands seen under the microscope in this type of muscle tissue.

Types of Striated Muscle

Striated muscle tissue can be classified into two main types:

  • Skeletal muscle: These are the muscles that are attached to the bones and are responsible for voluntary movements. They are striated and multinucleated.
  • Cardiac muscle: This is the muscle tissue found in the heart. It is also striated but unlike skeletal muscle, it is not under voluntary control.

Related Terms

  • Myofibril: The basic rod-like unit of a muscle cell. Myofibrils are composed of long proteins including actin, myosin, and titin, and other proteins that hold them together.
  • Sarcomere: The basic unit of a muscle's cross-striated myofibril. Sarcomeres are multi-protein complexes that give the muscle its striated appearance.
  • Actin: A protein that forms (together with myosin) the contractile filaments of muscle cells.
  • Myosin: A type of motor protein that is best known for its role in muscle contraction.
  • Titin: A giant protein that functions as a molecular spring which is responsible for the passive elasticity of muscle.

External links

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