Accession Number:

AD0626837

Title:

OBSERVATIONS ON KIDNEYS OF DESERT AND SWAMP ANIMALS. I. PLASMA AND URINE OSMOLALITY IN SOME DESERT AND SWAMPDWELLING MAMMALS,

Descriptive Note:

Corporate Author:

CHICAGO MEDICAL SCHOOL ILL DEPT OF ANATOMY

Report Date:

1964-01-01

Pagination or Media Count:

13.0

Abstract:

Urine and plasma osmolalities were determined by cryoscopy in deermice Peromyscus and rabbits Sylvilagus from arid and humid environments. Rabbits in wet environmental cages produced urine of 390 to 1200 milliosmolesliter. Those deprived of water produced urine of 800 to 1250 milliosmolesliter, and those given ADH in addition produced urine of 1300 and 1500 milliosmolesliter. Desert cottontails during the dryest season produced urine of 1100 to 2450 milliosmolesliter. Plasma osmolalities in all rabbits ranged from 300 to 430 milliosmolesliter with only two cases in eleven exceeding 350 milliosmolesliter. Dry season desert deermice showed plasma osmolalities from 500 to 900 milliosmolesliter while those examined during the relatively moist season showed plasma osmolalities from 375 to 420 milliosmolesliter. Dry season urine ranged from 1250 to 4400 milliosmolesliter while moist season urine ranged from 2435 to 4170 milliosmolesliter. In desert deermice an important method of adjustment to aridity, aside from the production of highly concentrated urine, appears to be the ability to vary plasma osmolality and to tolerate a highly concentrated plasma osmolality. Plasma osmolalities in deermice from cool, wet environments ranged from 250 to 440 milliosmolesliter while urine ranged from 550 to 3100 milliosmolesliter. Author

Subject Categories:

  • Anatomy and Physiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE