To understand the function of each muscle one has to remember the specific attachment sites to the bone. This muscle, as the name describes, attaches to the sternum, the clavicle and the mastoid apophysis. If the muscle contracts, this will produce a linear pull that will expand the thoracic cavity. Therefore, one can assume this muscle will have a crucial role in forced inhalation.
Abstinence means to avoid or not want to do something. It is preferred that high school children under the age of 18 restrain from sexual activity. (Hope this helps if it did pls mark brainliest!)
