Accession Number : AD0754993

Title :   Role of Reflexes from the Heart in Control of the Circulation under Stressful Conditions.

Descriptive Note : Interim progress rept. 1 Sep 71-31 Aug 72,

Corporate Author : UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF PHYSIOLOGY

Personal Author(s) : Meehan,John P. ; Henry,James P.

Report Date : 25 OCT 1972

Pagination or Media Count : 5

Abstract : The research is concerned with the role of the cardiac receptors in the regulation of sodium excretion through alteration of renal nerve activity. The sensitivity of the right and left atrial receptors to changes in blood volume are currently being evaluated by examining the changes in atrial afferent impulse traffic in the cervical vagus. Preliminary findings indicate that the right atrial receptors are more sensitive to changes in thoracic blood volume than the left atrial receptors. Further, it appears that a similar difference occurs in the receptor's response to a decrease in total blood volume. These preliminary studies have also indicated that as little as a 1% hemorrhage significantly alters cardiac vagal afferent activity. Advances in the understanding of the mechanisms by which atrial receptors affect renal function strengthen the original hypothesis that cardiac receptors have the primary function of adjusting the cardiovascular system to minor changes and shifts in circulating volume. (Author)

Descriptors :   (*CARDIOVASCULAR SYSTEM, *KIDNEYS), PHYSIOLOGY, HEART, BLOOD VOLUME, BLOOD CIRCULATION, EXCRETION, BODY FLUIDS, ELECTROLYTES(PHYSIOLOGY), NERVES

Subject Categories : Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE