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Cards In This Set
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What are the functions of the respiratory system
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1. provide body w/ O2; elimination of CO2
2. acid-base balance: respiratory system helps regulate pH
3. olfaction (smelling)
4. vocalization
*O2 is needed for aerobic metabolism
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Providing body with O2, eliminating CO2 requires...
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1. ventilation= mechanical process of moving air into/out of lungs (breathing)
2. gas exhange btwn alveoli & blood via simple diffusion
3. gas transport: transport of O2, CO2 in blood
4. gas exhange at tissue level: btwn blood & tissues via simple diffusion
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What organs are part of the respiratory system?
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-nasal & oral cavities
-pharynx/larynx
-trachea
-bronchi/bronchioles
-alveoli
-lungs
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What do the terminal bronchioles lead to?
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Alveoli
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What is the diameter of the microscopic site of gas exchange?
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.3 mm
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How many alveoli do humans have?
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300 million alveoli
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What are the type of cells that make up alveoli?
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Type I cells
Type II cells
macrophages
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What are Type I cells?
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Gas exhange here, across respiratory membrane
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What is the respiratory membrane?
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Type I cell epithelium + capillary endothelium:
.5 - 1x10^-6 m think
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What is the function of Type II cells?
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Secrete surfacant
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