The Digestive, Respiratory, and Urinary Systems
The contraction of the _________ causes active inhalation, and is normally involuntarily controlled by respiratory centers located in the _________.
|C||Rectus abdominus; brainstem|
|D||Rectus abdominus; cerebellum|
The diaphragm is the sheetlike muscle that separates the thoracic and abdominal cavities; its contraction, regulated by the brainstem, is largely responsible for inhalation. The rectus abdominus is an abdominal muscle that moves the body; the cerebellum is involved with the coordination of movement.