BIOL 030 Lecture Notes - Lecture 27: Hyaline Cartilage, Bronchopulmonary Segment, Bronchus

• School: College of The Sequoias
• Department: Biology (BIOL)
• Course: BIOL 030
• Professor: flora

Document Summary

Lungs are crowded by adjacent organs; they neither fill the entire ribcage, nor are they symmetrical. Shorter than left because liver rises higher on the right. Has three lobes superior, middle, and inferior separated by horizontal and oblique fissure. Tall and narrow because the heart tilts toward the left and occupies more space on. Has two lobes superior and inferior separated by a single oblique fissure. A branching system of air tubes in each lung. From main bronchus to 65,000 terminal bronchioles. Three right lobar (secondary) bronchi: superior, middle, and inferior. Two left lobar bronchi: superior and inferior. Bronchopulmonary segment: functionally independent unit of the lung tissue. Divides into 50 to 80 terminal bronchioles. Each terminal bronchiole gives off two or more smaller respiratory bronchioles. Divide into 2 to 10 alveolar ducts. End in alveolar sacs: clusters of alveoli arrayed around a central space called the atrium.