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Gas exchange, Low SA/Vol, Primitive gas exchange, Spirometer measures,…
Gas exchange
Examples
Cell
Grasshopper
Spider
Fish
Elephant
Human lungs adaptations
Alvioli
One way permeability
O2 only has to cross a layer of only 2 cells (not 5 or 6)
They are moisty on the inside (O2 dissolves better in water)
Lungs
Trahea
Bronchus
Bronchiole
Alvioli
Has a thin layer of water for better gas solubility
Surfacant reduces surface tension to spread out the water in a super thin layer
Bronchiole
Bronchus
Inspiration (inhale)
↑vol of lungs
Expiration
↓ vol of lungs
Low SA/Vol
High
Primitive gas exchange
Sophisticated gas exchange
Spirometer measures
tidal volume (avg volume breathed)
Vital capacity (max vol - min vol)
Expiratory reserve (vol you can inhale/exhale after you think you're done)
Chest belt measures
Ventilation rate (№breaths per minute)
