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Related Concept Videos

Autoregulation of Blood Flow01:17

Autoregulation of Blood Flow

Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.
Physiology of the Genitourinary System I: Renal Blood Flow and Glomerular Filtration01:29

Physiology of the Genitourinary System I: Renal Blood Flow and Glomerular Filtration

The kidneys are vital organs responsible for regulating blood filtration, waste excretion, and fluid balance, all of which are crucial for maintaining homeostasis. Renal physiology examines renal blood flow, glomerular filtration, and urine formation, ensuring the body’s internal environment remains stable.Renal Blood FlowThe kidneys receive about 20-25% of the cardiac output, typically around 1200 mL of blood per minute in an average adult. Blood flows into the kidneys through the renal...
Imaging Studies VII: Vascular Imaging01:19

Imaging Studies VII: Vascular Imaging

DefinitionRenal angiography, also known as renal arteriography, is an imaging technique used to obtain a comprehensive view of blood flow and the vascular structure of blood vessels in the kidneys and surrounding areas.PurposeRenal angiography detects blood vessel abnormalities in the kidneys, such as aneurysms, stenosis, thrombosis, vascular tumors, and renal artery stenosis. It evaluates kidney function and guides interventional treatments like angioplasty or stent placement.Pre-Procedure...
Glomerular Filtration Rate and its Regulation01:28

Glomerular Filtration Rate and its Regulation

The Glomerular Filtration Rate (GFR) is a measure of kidney function, reflecting the volume of filtrate formed per minute in the kidneys. On average, GFR is approximately 125 mL/min in males and 105 mL/min in females. Maintaining a relatively constant GFR is essential for the kidneys to effectively regulate body fluid homeostasis and maintain extracellular stability.
GFR regulation involves two primary intrinsic controls: the myogenic and tubuloglomerular feedback mechanisms.
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Blood and Nerve Supply to the Kidney01:18

Blood and Nerve Supply to the Kidney

The kidneys are vital organs responsible for filtering and cleaning blood, removing waste products, and regulating electrolyte levels. To perform these essential functions, they require a constant and robust blood supply.
Bloody Supply to the Kidneys:
The kidneys receive their blood supply from the renal arteries, which branch off from the abdominal aorta—the main artery supplying the abdomen and lower body. The renal arteries enter the kidneys at the hilum, a notch on the medial side of each...
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Antihypertensive Drugs: Angiotensin II Receptor Blockers

In the renin-angiotensin-aldosterone system, a hormone called angiotensin II plays a crucial role. It binds to the AT1 receptors in vascular smooth muscles coupled with Gq proteins. The activation of these receptors activates an enzyme called phospholipase C, which releases two molecules: inositol trisphosphate and diacylglycerol. These molecules cause a chain reaction that leads to the phosphorylation of myosin light chains and promotes interaction between actin and myosin, leading to smooth...

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Updated: Jun 19, 2026

A Large Animal Model for Acute Kidney Injury by Temporary Bilateral Renal Artery Occlusion
09:02

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Published on: February 2, 2021

THE BEHAVIOR OF RENAL BLOOD FLOW AFTER PARTIAL CONSTRICTION OF THE RENAL ARTERY.

H A Schroeder1, J M Steele

  • 1Hospital of The Rockefeller Institute for Medical Research.

The Journal of Experimental Medicine
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Constricting renal arteries in dogs showed blood flow readjustment. Marked constriction increased susceptibility to adrenalin, potentially causing hypertension and indicating independent renal circulation control.

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Area of Science:

  • Nephrology
  • Cardiovascular Physiology

Background:

  • Renal blood flow regulation is crucial for maintaining kidney function.
  • Understanding the renal circulation's response to arterial constriction is vital.

Purpose of the Study:

  • To investigate the behavior of renal blood flow following partial renal artery constriction in dogs.
  • To examine the impact of adrenalin on renal blood flow after constriction.
  • To explore the control mechanisms of renal circulation.

Main Methods:

  • Partial constriction of the renal artery was performed in twenty-four dogs.
  • Renal blood flow was monitored.
  • The effects of varying doses of adrenalin were observed.
  • Arterial blood pressure was measured.

Main Results:

  • Renal blood flow demonstrated a tendency to readjust toward normal levels within minutes after initial constriction.
  • Marked renal artery constriction led to increased sensitivity to adrenalin, with potential cessation of flow.
  • Partial constriction of a renal artery, combined with adrenalin administration, induced significant arterial hypertension.
  • Findings support the independence of renal circulation control from systemic arterial pressure.

Conclusions:

  • The renal circulation exhibits a dynamic autoregulatory capacity in response to partial arterial constriction.
  • Adrenalin significantly impacts renal blood flow, especially under conditions of compromised renal artery flow.
  • The renal vasculature appears to possess intrinsic regulatory mechanisms separate from overall systemic blood pressure control.