BIOL 1040 Chapter 22: Gas Exchange

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7 Feb 2017
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Biol 1040
Chapter 22
Gas Exchange
1. Breathing
2. Transport of gasses
3. Exchange of gasses with body cells
Gasses are exchanged across moist body surfaces
Called the respiratory surface, has living cells and is therefore moist
Gas exchange takes place by diffusion
The earthworm uses its entire outer skin as a gas exchange organ
Animals that breathe through their skin are small to provide a high surface area/volume
ratio
Ventilation: flow of water or air over respirator surface (like water passing over gills of a
fish)
Gills: extensions/outfoldings of body surface specialized for gas exchange
In terrestrial animals, respirator surface is inside, instead of attached to, the body
Tracheal system: in insects
Lungs: internal sacs lined with moist epithelium
Lungs helped tetrapods evolve to live on land
Lungs
Lungs located in thoracic cavity in chest
Protected by rib cage
Separated by abdominal cavity by diaphragm
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