Dissertatio inauguralis physico-medica de respiratione
 quam consensu & auctoritate gratiosissimi medicorum ordinis in universitate patria pro summis in arte medica honoribus & privilegiis doctoralibus rite consequendis....

by Daniel Bernoulli

"Dissertatio inauguralis physico-medica de respiratione" by Daniel Bernoulli is a scientific publication written in the early 18th century. This treatise explores the complex mechanisms of respiration, diving into the physiological processes involved in inhalation and exhalation. Bernoulli, a notable figure in the history of science and mathematics, works to elucidate how air enters the lungs and its subsequent role in blood oxygenation and overall bodily function. In this detailed examination, Bernoulli presents a thorough analysis of the mechanics of respiration, identifying the roles of different muscles, such as the intercostal muscles and diaphragm, in facilitating the act of breathing. He elaborates on the physiological aspects of breathing, asserting that inspiration involves the elevation of the ribs and the lowering of the diaphragm, which together expand the thoracic cavity and draw air into the lungs. Furthermore, Bernoulli tackles the significant question of whether the air inhaled is entirely expelled during exhalation, or if a portion enters the bloodstream, proposing arguments to support his conclusions about the respiratory system’s critical function for sustaining life. The work combines observations, mathematical reasoning, and anatomical knowledge, making it both a technical document and an important contribution to early respiratory physiology.