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  2. Muscle contraction - Wikipedia

    en.wikipedia.org/wiki/Muscle_contraction

    The strength of skeletal muscle contractions can be broadly separated into twitch, summation, and tetanus. A twitch is a single contraction and relaxation cycle produced by an action potential within the muscle fiber itself. [27]

  3. Sliding filament theory - Wikipedia

    en.wikipedia.org/wiki/Sliding_filament_theory

    The sliding filament theory explains the mechanism of muscle contraction based on muscle proteins that slide past each other to generate movement. [1] According to the sliding filament theory, the myosin ( thick filaments ) of muscle fibers slide past the actin ( thin filaments ) during muscle contraction, while the two groups of filaments ...

  4. Sarcoplasmic reticulum - Wikipedia

    en.wikipedia.org/wiki/Sarcoplasmic_reticulum

    Cardiac and skeletal muscle cells contain structures called transverse tubules (T-tubules), which are extensions of the cell membrane that travel into the centre of the cell. T-tubules are closely associated with a specific region of the SR, known as the terminal cisternae in skeletal muscle, with a distance of roughly 12 nanometers, separating ...

  5. Skeletal muscle - Wikipedia

    en.wikipedia.org/wiki/Skeletal_muscle

    Following contraction, skeletal muscle functions as an endocrine organ by secreting myokines – a wide range of cytokines and other peptides that act as signalling molecules. [62] Myokines in turn are believed to mediate the health benefits of exercise. [63] Myokines are secreted into the bloodstream after muscle contraction.

  6. Muscle cell - Wikipedia

    en.wikipedia.org/wiki/Muscle_cell

    Skeletal muscle cells are the individual contractile cells within a muscle and are more usually known as muscle fibers because of their longer threadlike appearance. [10] Broadly there are two types of muscle fiber performing in muscle contraction , either as slow twitch ( type I ) or fast twitch ( type II ).

  7. Myosin - Wikipedia

    en.wikipedia.org/wiki/Myosin

    Sliding filament model of muscle contraction. Cardiac sarcomere structure featuring myosin. Myosin II (also known as conventional myosin) is the myosin type responsible for producing muscle contraction in muscle cells in most animal cell types. It is also found in non-muscle cells in contractile bundles called stress fibers. [18]

  8. Muscular system - Wikipedia

    en.wikipedia.org/wiki/Muscular_system

    Skeletal muscle, is a type of striated muscle, composed of muscle cells, called muscle fibers, which are in turn composed of myofibrils. Myofibrils are composed of sarcomeres, the basic building blocks of striated muscle tissue. Upon stimulation by an action potential, skeletal muscles perform a coordinated contraction by shortening each sarcomere.

  9. Muscle tone - Wikipedia

    en.wikipedia.org/wiki/Muscle_tone

    In physiology, medicine, and anatomy, muscle tone (residual muscle tension or tonus) is the continuous and passive partial contraction of the muscles, or the muscle's resistance to passive stretch during resting state. [1] [2] It helps to maintain posture and declines during REM sleep. [3]