(BIOD 331) 5.2: Mechanics of Breathing and Lung Function | Questions with Correct Answers

(BIOD 331) 5.2: Mechanics of Breathing and Lung Function | Questions with Correct Answers

Ventilation Mechanical process using pressure differences to move air in and out of lungs



Intrapulmonary Pressure Pressure inside airways and alveoli, equal to atmospheric
pressure at rest



Intrapleural Pressure Pressure in pleural cavity, negative relative to intrapulmonary
pressure



Intrathoracic Pressure Pressure in thoracic cavity, equal to intrapleural pressure



Diaphragm Main muscle of inspiration, innervated by C3, C4, and C5



Paradoxical Movement Chest moves up on paralyzed diaphragm side during inspiration



Lung Compliance Ease with which lungs can inflate, influenced by water content and
fibers



Surface Tension Force exerted by water molecules on alveolar surface, countered by
surfactants



Elastin Fibers Stretch easily, increasing lung tissue compliance



Collagen Fibers Resist stretching, decreasing lung compliance



Elastic Recoil Ability of lung elastic fibers to return to original position after stretching



Tidal Volume (VT) Volume of air inhaled or exhaled with each breath, around 500 mL