Contraction of the thin sheet of muscle separating the lungs from the abdominal cavity called the

The is the most efficient muscle of breathing. It is a large, dome-shaped muscle located at the base of the lungs.

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.