wicked-naughtily or annoyingly playful; teasing and worrying with impish laughter; a wicked prank. impish, implike, mischievous, pixilated, prankish, puckish, arch. playful-full of fun and high spirits; playful children just let loose from school.
Inspiratory Muscles. The principal muscle of inspiration is the diaphragm, a domed sheet of muscle that separates the thoracic and abdominal cavities. The diaphragm attaches to the lower ribs, as well as to the lumbar vertebrae of the spine.
Contractions happen when actin filaments actually slide over myosin filaments. This slide causes a change in the shape of the muscle cells producing movement, which is considered a muscle contraction. Depending on the muscle and the intended outcome of the contraction, muscles can either lengthen or shorten.nstead, a muscle contraction of smooth or cardiac muscle is initiated within the organ itself. Within the digestive system, the introduction of food is what causes the contractions to move the food through the system.