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Transcript of Respiratory System
Gas Exchange & Control
1. External respiration:
medium for gas exchange between environment and circulatory system
3. Blood pH regulation
4. Enhancing venous return
Upper Respiratory Tract
Lower Respiratory Tract
Upper respiratory tract
Lower respiratory tract
Alveoli = increase in surface area
Respiratory Mucosa (Conducting Zone)
Pseudostratified ciliated epithelium
Stratified squamous epithelium
Nose and nasal cavity
Nasal Mucosa Functions
Laryngeal sound production
Trachea and Bronchi
Respiratory Zone Histology
Simple cuboidal epithelium (bronchioles)
Simple squamous epithelium (alveoli)
more smooth muscle
Each lung contains ~150 million alveoli
Type I cells: simple squamous epitelium
Type II (septal) cells: surfactant production
-reduces surface tension
-prevents alveolar collapse
the site of gas exchange
1. alveolar squamous epithelium
2. capillary endothelium
3. fused basal lamina
Question of the Day
These two pictures were taken ten feet apart, 301.4 miles away from 101 Gaines Hall:
1. Where where they taken?
2. Why are they different?