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  2. Myoclonus - Wikipedia

    en.wikipedia.org/wiki/Myoclonus

    Myoclonus is a brief, involuntary, irregular (lacking rhythm) twitching of a muscle, a joint, or a group of muscles, different from clonus, which is rhythmic or regular. Myoclonus (myo-"muscle", clonus "spasm") describes a medical sign and, generally, is not a diagnosis of a disease.

  3. Involuntary muscle - Wikipedia

    en.wikipedia.org/wiki/Involuntary_muscle

    Involuntary muscle may refer to: Smooth muscle tissue; Cardiac muscle This page was last edited on 16 ...

  4. List of reflexes - Wikipedia

    en.wikipedia.org/wiki/List_of_reflexes

    Vagovagal reflex — contraction of muscles in the gastrointestinal tract in response to distension of the tract following consumption of food and drink. Vestibulocollic reflex; Vestibulo-spinal reflex; Vestibulo-ocular reflex — movement of the eyes to the right when the head is rotated to the left, and vice versa. Withdrawal reflex; Yawn

  5. Muscular system - Wikipedia

    en.wikipedia.org/wiki/Muscular_system

    The muscular system is an organ system consisting of skeletal, smooth, and cardiac muscle. It permits movement of the body, maintains posture, and circulates blood throughout the body. [1] The muscular systems in vertebrates are controlled through the nervous system although some muscles (such as the cardiac muscle) can be

  6. Hiccups are common and usually harmless. But they can ... - AOL

    www.aol.com/hiccups-common-usually-harmless...

    Hiccups are "involuntary spasms of the diaphragm," Pullins explains. The diaphragm is the dome-shaped muscle that's located below the lungs and heart. When these spasms or involuntary contractions ...

  7. Cardiac muscle - Wikipedia

    en.wikipedia.org/wiki/Cardiac_muscle

    Cardiac muscle (also called heart muscle or myocardium) is one of three types of vertebrate muscle tissues, the others being skeletal muscle and smooth muscle. It is an involuntary, striated muscle that constitutes the main tissue of the wall of the heart .

  8. Dystonia is a disorder that causes repetitive involuntary ...

    www.aol.com/news/dystonia-disorder-causes...

    Dystonia is a disorder of involuntary muscle contractions that may cause repetitive and/or abnormal movement or postures.

  9. Hypnic jerk - Wikipedia

    en.wikipedia.org/wiki/Hypnic_jerk

    A hypnic jerk, hypnagogic jerk, sleep start, sleep twitch, myoclonic jerk, or night start is a brief and sudden involuntary contraction of the muscles of the body which occurs when a person is beginning to fall asleep, often causing the person to jump and awaken suddenly for a moment.