BIOLOGY 20 Lecture Notes - Lecture 30: East Los Angeles College, Venous Plexus, Macrophage
Document Summary
Serves as a resonating chamber that amplifies the voice. Erectile tissue in the nasal cavity extensive venous plexus in inferior concha. Every 30 60 minutes, erectile tissue on one side swells with blood. Allowing engorged side time to recover from drying. Flow of air shifts between the right and left nostrils once or twice an hour. Trachea (windpipe): a rigid tube about 12cm long and 2. 5cm in diameter. Supported by 16 to 20 c- shaped rings of hyaline cartilage. Reinforces the trachea and keeps it from collapsing when you inhale. Opening in rings faces posteriorly towards esophagus trachealis muscle spans opening in rings. Muscle contracts or relaxes to adjust air flow. Bronchial tree a branching system of air tubes in each lung. From main bronchus to 65000 terminal bronchioles. Main (primary) bronchi supported by c shaped hyaline cartilage rings. Segmental (tertiary) bronchi) supported by crescent shaped cartilage plates. 10 on right and 8 on left.
