2. Function of Respiratory System
1. Gets air into and out of the body and
allows gas exchange
2. Conducting portion
1. Nasal cavity, nasopharynx, larynx, trachea,
bronchi, bronchioles, terminal bronchioles
2. Warms, moistens air
3. Respiratory portion
1. Respiratory bronchioles, alveolar ducts,
alveoli
2. Gas exchange occurs
9. Small Granule Cell
(DNES)
Electron micrograph of a cell
of the diffuse neuroendocrine
system. Note the
accumulation of secretory
granules (arrows) in the basal
region of the cell. The Golgi
complex seen in the upper
part of the micrograph shows
some secretory granules.
20. Trachea
Pseudostratified Epithelium
Pseudostratified ciliated cells and mucous (goblet) cells are the two
major components of the epithelium. Cilia beat at 1,000 to 1,500 cycles
per minute resulting in movement of the mucus blanket at 0.5-1 mm
/min in small airways and 5-20 mm/min in the trachea and main
bronchi.