Respiratory system takes in oxygen and expels carbon dioxide. Lungs located in thorax protected by bony and muscular cage. Airways divided into upper (nose, sinuses, pharynx) and lower (larynx, trachea) systems
Breathing is pulmonary ventilation, moving air between atmosphere and lung alveoli. Thoracic cage encloses respiratory system structures, providing rigidity and flexibility. System includes 12 pairs of ribs, sternum, and thoracic vertebrae
Lungs are located in thorax, enclosed in pleura membrane. Right lung has three lobes, left lung has two lobes. Bronchi form upside-down "Y" in chest, branching into bronchioles. Alveoli at bronchiole ends where oxygen-carbon dioxide exchange occurs
Thorax is superior part of trunk between neck and abdomen. Contains thoracic wall, cavities, neurovasculature, internal organs, and breasts. Thoracic wall consists of sternum, ribs, vertebrae, and intercostal spaces. Contains two major openings: superior thoracic aperture and inferior thoracic aperture
Lungs are located below rib cage and above diaphragm. Right lung is wider but shorter, making room for liver. Left lung is narrower, accommodating heart. Men's lungs hold 750cc air, women's 285-393cc
Each lung has an apex, base, three borders and three surfaces. Apex extends into neck above medial 1/3rd of clavicle. Base is semilunar and concave, related to diaphragm. Right lung has two fissures and three lobes. Left lung has one fissure and two lobes