1. Outline the physiology of inspiration vs. expiration. Consider these things: the muscles involved, if these...

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Medical Sciences

1. Outline the physiology of inspiration vs. expiration.Consider these things: the muscles involved, if these muscles arecontracting or relaxing, the way volumes and pressures are changingin the thoracic cavity, and the relationship between thesepressures and volumes.
2. What does it mean if a system has negative pressure? Whatforces cause the negative intrapleural pressure betweenbreaths?

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Answer 1 The process of inspiration breathing in and expiration breathing out are vital for providing oxygen to tissues and removing carbondioxide from the body Inspiration occurs via active contraction of muscles such as the diaphragm whereas expiration tends to be passive unless it is forced The Lungs and Breathing The space between the outer surface of the lungs and inner surface thoracic wall is known as the pleural space This is usually filled with pleural fluid forming a seal which holds the lungs against the thoracic wall by the force of surface tension This seal ensures that when the thoracic cavity expands or reduces the lungs undergo expansion or reduction in size accordingly During breathing the contraction and relaxation of muscles acts to change the volume of the thoracic cavity As the thoracic cavity and the lungs moves together this changes the volume of the lungs in turn changing the pressure inside the lungs Boyles law states that the volume of gas is inversely proportional to pressure when temparature is See Answer

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