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.
This is contraction happening, and then the muscle relaxes and it goes back to how it was before. Contraction happens, the muscle relaxes, and then it goes back to how it was before. To put that in perspective, this is me working out in the gym, and as I contract the muscles in my arms, this is what happens. So, my bicep muscles contract, I pull it up, you can see it shortening. The sarcomere is getting shorter.