Best Answer: In order for air to enter the lungs 2 things must happen. 1. The diaphragm must contract. This increases the volume ofthe thoracic cavity. 2. The intercostal muscles (rib muscles) will pull he ribs up and outward also increasing the cavity's volume. Bothe of these will decrease the pressure inside the cavity and air will rush in from the outside.
The Ming dynasty (1368â1644), founded by the peasant rebel leader Zhu Yuanzhang (known posthumously as Emperor Taizu), was an imperial dynasty of China. It was the successor to the Yuan dynasty and the predecessor of the short-lived Shun dynasty, which was in turn succeeded by the Qing dynasty. Scholars have traditionally divided Ming history into three distinct periods: Early (1368â1436), Middle (1436â1573), and Late (1573â1644).
In no particular order, and most of these tie into each other: 1. Irresponsible emperors and political faction struggle. Most historians view the later reign of Wanli Emperor (1563-1620) as the starting point of the Ming dynasty's decline. After Wanli's three successful campaigns (1592 - 1600), he stopped doing his administrative duties, delegating power to the eunuchs and leading to a power struggle between political factions of the ministers.