MUSCLES OF RESPIRATION. When the diaphragm contracts in inspiration, initially the lower ribs are fixed and the dome of the diaphragm descends, thus increasing the vertical diameter of thorax.
arrearage. 1  the state or condition of being in arrears. 2  Often, arrearages. arrears; amount or amounts overdue. 3  Archaic. a thing or part kept in reserve.
Abreast is defined as things that are next to each other. An example of abreast is a row of soldiers marching in a parade. Abreast means to keep up with something and to stay up-to-date. An example of abreast is the president of a company that stays informed on the competitionâs new products.