BIOL 208 Lecture Notes - Lecture 21: Bronchiole, Simple Squamous Epithelium, Alveolar Cells
19 May 2018
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Lecture 21
April 19th , 2018
- Alveolar pores - connect 1 alveoli to another
- Squamous epithelium
- Begins w/ respiratory bronchiole
- Lines all alveoli parts
- Thorax
- Actual space is small
- Outside border of lungs
- Surrounded by visceral and parietal pleura
- Visceral - attached to lungs
- Parietal - attached to chest wall
- Pleural cavity
- Produced by simple squamous (mesothelium) cell that line all serous
cavities
- Intrathoracic cavity
- Aka pleura cavity
Respiratory membrane
- Aka diffusion barrier
- Alveolar capillary membrane
- 1) epithelium
- 3 cells
- 1) primary pneumocyte (type 1)
- Simple squamous
- Most relevant
- Continuous
- Primary source of ACE
- 2) secondary pneumocytes (type 2)
- Aka septo cells
- Border of 1 alveoli and other alveoli
- Produces surfactant
- Surfactant
- Prevents lungs from collapsing
