The Democratic Party presidential primaries and caucuses are indirect elections in which voters cast ballots for a slate of delegates to the 2016 Democratic National Convention; these delegates in turn directly elect the Democratic Party's presidential nominee.or the U.S. territories of Puerto Rico, American Samoa, Guam, and the U.S. Virgin Islands; and Democrats Abroad, fixed numbers of pledged delegates are allocated. Each state and U.S territory will also be awarded bonus pledged delegates based on whether they schedule their primary or caucus later in the primary season.
Diaphragmâs Role in Breathing. When the diaphragm contracts and moves lower, the chest cavity enlarges, reducing the pressure inside the lungs. To equalize the pressure, air enters the lungs. When the diaphragm relaxes and moves back up, the elasticity of the lungs and chest wall pushes air out of the lungs. The lungs have no skeletal muscles of their own. The work of breathing is done by the diaphragm, the muscles between the ribs (intercostal muscles), the muscles in the neck, and the abdominal muscles.
Air pressure expands because the air molecules take up space in your lungs, causing your chest to expand. Furthermore, air can be compressed to fit in a smaller volume since there's a lot of empty space between the air molecules.