QS Study

Name the Blood Pressure Regulatory System

Blood pressure is the lateral pressure exerted by blood in per unit area of vessel wall while flowing through it. It is the force that moves blood through our circulatory system. It is a vital force because oxygen and nutrients would not be pushed around our circulatory system to nourish tissues and organs without blood pressure.

The kidneys provide a hormonal mechanism for the regulation of blood pressure by managing blood volume. The reninā€angiotensinā€aldosterone system of the kidneys regulates blood volume. In response to rising blood pressure, the juxtaglomerular cells in the kidneys secrete renin into the blood.

Two major types of arterial pressure control system in the body.

  1. Nervous mechanism.
  2. Humoral mechanism.

Nervous mechanism: 2 types

(i) Short-term regulation: Occurs within seconds to minute.

(A) Mechanism occurs within seconds

  • Baroreceptor feedback mechanism
  • Chemoreceptor feedback mechanism
  • Central nervous system ischemic mechanism.

(B) Mechanism occurs within minutes

  • Renin-angiotensin vasoconstrictor mechanism
  • Capillary fluid shift mechanism.
  • Stress relaxation changes in a vasculature.

(ii) Long-term regulation-Occurs within hours.

(A) Renal body fluid mechanism

(B) Renin-angiotensin mechanism

 

Humoral mechanism

  • Epinephrine – nor epinephrine mechanism
  • Vasopression vasoconstrictor mechanism
  • Renin-angiotensin-aldosterone mechanism