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.
Muscle contractions occur through the sliding of actin and myosin filaments past one another. The filaments themselves do not contract and the other elements of an individual sarcomere are not compressed.The sarcomere is able to contract without seriously bending or distorting itself.Contraction ends when the actin filaments on opposite sides of the sarcomere come into contact and the myosin comes into contact with the Z-lines forming the boundaries of the sarcomere.View the animation below, then complete the quiz to test your knowledge of the concept.uscle contractions occur through the sliding of actin and myosin filaments past one another. The filaments themselves do not contract and the other elements of an individual sarcomere are not compressed.