On June 6, 2002, President Bush announced his plans to create the Department of Homeland Security (DHS), and in July 2002, his administration released the national strategy for homeland security. Unlike OHS, the DHS is a permanent agency and has budgetary authority over its mission. It also has a more comprehensive national strategy.
The nose and nasal cavity is what begins the process inside the respiratory system. The nose is the organ with which we breathe air in. The nasal cavity is the are inside the nose, separated from the oral cavity (the area inside the mouth) by the nasal spine. The purpose of the nasal cavity is to deliver cleaned, moistened, and warmed air to the pharynx (throat). The cavity is lined with mucous that has tiny hairs on it. The hairs trap dust particles and other pathogens so that the air clean to pass into the next stage.
The cranial cavity cushions and protects the brain within a rigid skull. The other body cavities also cushion internal organs, but instead of being rigid, they have to be flexible for the heart, lungs, digestive organs, and reproductive organs to expand.