Accession Number : AD0730540

Title :   Reflex Control of the Circulation,

Corporate Author : MEDICAL COLL OF VIRGINIA RICHMOND DEPT OF MEDICINE

Personal Author(s) : Kontos,Hermes A. ; Patterson,John L. , Jr

Report Date : 1971

Pagination or Media Count : 17

Abstract : The need for regulation of cardiovascular function arises from the fact that the circulation does not operate continuously at maximum capacity, which would obviously be a wasteful type of operation. This is avoided by the provision of numerous control mechanisms which adjust cardiovascular function to the requirements of the tissues. These control mechanisms may be broadly classified into local, neural, and hormonal mechanisms. The local mechanisms are chemical or physical in nature and are concerned with the regulation of regional blood flow according to the functional requirements of each organ or tissue. Neural control mechanisms are concerned with the maintenance of arterial blood pressure and the distribution of blood flow to various organs. Because of the rapidity with which reflex neural mechanisms can effect changes in the function of the heart and changes in a large number of vascular beds, they are particularly well suited to bring about the necessary alterations in cardiovascular function in emergency situations. Hormonal mechanisms supplement neural controls, but their effect is, by and large, slower and more sustained. (Author)

Descriptors :   (*CARDIOVASCULAR SYSTEM, REFLEXES), (*CENTRAL NERVOUS SYSTEM, *BLOOD CIRCULATION), CONTROL, NERVOUS SYSTEM, PHYSIOLOGY, BLOOD VESSELS, NERVES, RESPIRATORY SYSTEM, HEART, EMOTIONS, BLOOD PRESSURE

Subject Categories : Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE