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).
This was one of the greatest Ming Dynasty inventions and was introduced in 1403. This inspired todayâs encyclopedia. The Ming Dynasty is considered to be one of the most prosperous and glorious periods in the history of China.Apart from the enchanting attractions, spectacular artifacts, and the Great Wall, the Ming Dynasty was also known for its wonderful innovations.his invention occurred around 1498, during the reign of the Hongzhi Emperor of the Ming Dynasty. This was mass-produced in 1780, several years after the fall of the Ming Dynasty. Before the toothbrush was invented, people used sticks and flared edges called chew sticks. After this, pig bristles were used.