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Muscle Physiology

Muscle Physiology. How They Work. Muscle Fibers. Muscles are made of many individual cells called fibers The Fascia connects the individual fibers to form a muscle and it separates muscles from each other. . Muscles have 3 layers of C.T.

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Muscle Physiology

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  1. Muscle Physiology How They Work

  2. Muscle Fibers • Muscles are made of many individual cells called fibers • The Fascia connects the individual fibers to form a muscle and it separates muscles from each other.

  3. Muscles have 3 layers of C.T. • Epimysium: outermost layer that surrounds the whole muscle • Perimysium: Surrounds and separates the fascicles • Endomysium: surrounds each individual muscle fiber

  4. Muscle fiber membrane: • The plasma membrane of a muscle fiber is called the sarcolemma • The cytoplasm is called the sarcoplasm

  5. Inside the sarcolemma • The many parallel fibers inside the muscle cell are called myofibrils. • Each myofibril is made of protein filaments called myofilaments. • The thin filaments are actin. • The thick filaments are called myosin.

  6. What is a sarcomere? • Actin and Myosin filaments are arranged in an overlapping pattern of light ("I" bands) and dark ("A" bands). • In the middle of each "I" band is a line called a "Z" line. • The section of a myofibril from one Z-line to the next Z-line is the SARCOMERE.

  7. The arrangement of the sarcomeres produces the familiar striations of skeletal muscle.

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