Biol. Bull.
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Biol Bull 147: 274-293. (October 1974)
© 1974 Marine Biological Laboratory
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ROLES OF OXYGEN AND CARBON DIOXIDE IN THE CONTROL OF SPIRACULAR FUNCTION IN CECROPIA PUPAE

BARBARA N. BURKETT 1 and HOWARD A. SCHNEIDERMAN 2

1 Department of Biology, University of Miami, Coral Gables, Florida 33124
2 Center for Pathobiology, University of California, Irvine, California 92664

1. A technique was developed for perfusing the entire tracheal system of an insect with a known gas mixture at a rate that insured constant average intratracheal concentrations of oxygen and carbon dioxide. In addition to this technique, a method was devised to provide a ganglion with its own gas supply, separate from that of the rest of the insect. These techniques enabled us to show the following:

2. The behavior of the spiracles is unaffected when physiological concentrations of carbon dioxide are perfused through the ganglion. However, carbon dioxide perfused through the spiracles does affect valve behavior. Hence the primary response to carbon dioxide is peripheral.

3. The behavior of the spiracles is affected by varying the concentration of oxygen through the ganglion. Hence the primary response to oxygen is central.

4. Central nervous control of spiracular behavior resides primarily in the ganglion of the same segment in which spiracles are located.

5. Not only does oxygen affect the CO2-trigger threshold but also carbon dioxide affects the O2-flutter threshold. Moreover, the interaction between oxygen and carbon dioxide occurs peripherally.




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