Accession Number:

AD0686083

Title:

THERMOREGULATORY RESPONSES OF THE UNANESTHETIZED CAT TO PREOPTIC AND ENVIRONMENTAL TEMPERATURE,

Descriptive Note:

Corporate Author:

NAVAL AIR DEVELOPMENT CENTER JOHNSVILLE PA AEROSPACE MEDICAL RESEARCH DEPT

Report Date:

1968-12-31

Pagination or Media Count:

34.0

Abstract:

The thermoregulatory component of oxygen consumption in the unanesthetized cat has been found to be proportional to the product of skin temperature minus a higher reference and preoptic temperature minus 43. Thus at normal preoptic and skin temperature, the thermoregulatory component of oxygen consumption is stimulated by both skin and brain thermoreceptors. On exposure to cold, the cat can maintain increased oxygen consumption even though preoptic cool-sensitive units decrease their stimulation as preoptic temperature rises, but the stimulation will not become minimal unless the preoptic region is heated to 43 C. In a hot environment, the sensitivity to preoptic cooling is greatly decreased. Our data suggest that vasoconstrictor drive also is a function of ambient temperature as well as preoptic temperature minus some higher reference. The preoptic temperature threshold for thermal polypnea is elevated as ambient temperature is lowered and thermal polypnea could not be evoked at a preoptic temperature of 42C in 29C air. Author

Subject Categories:

  • Anatomy and Physiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE