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.
1 Movement of air into and out of the lungs is called pulmonary ventilation, or breathing (Figure 13.3). 2  When inspiratory muscles contract, intrapulmonary volume increases, its pressure decreases, and air rushes in (inspiration).3  When inspiratory muscles relax, the lungs recoil and air rushes out (expiration). Each plunges into the hilus of the lung on its side. 2  The lungs are paired organs flanking the mediastinum in the thoracic cavity. 3  The lungs are covered with visceral pleura; the thorax wall is lined with parietal pleura. 4  Pleural secretions decrease friction during breathing.