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Related Concept Videos

Regulation of the Cardiovascular System01:27

Regulation of the Cardiovascular System

The regulation of the cardiovascular system allows the body to adapt to various demands and maintain homeostasis.
The regulation of the cardiovascular system involves the autonomic nervous system (ANS), baroreceptors, and chemoreceptors, ensuring that heart rate and blood pressure are appropriately modulated in response to varying physiological demands.
The ANS comprises two main divisions: the sympathetic and parasympathetic nervous systems. The sympathetic nervous system enhances...
Hormonal Regulation of Blood Pressure01:17

Hormonal Regulation of Blood Pressure

Endocrinal or hormonal intervention in the cardiovascular system is predominantly exerted by the catecholamines - epinephrine and norepinephrine, as well as a slew of hormones that interact with renal function to modulate blood volume.
Epinephrine and Norepinephrine
The adrenal medulla releases epinephrine and norepinephrine, catecholamines that enhance and extend the sympathetic or "fight or flight" physiological response. These hormones escalate heart rate and the force of contraction while...
Hypertension and Regulation of Blood Pressure01:18

Hypertension and Regulation of Blood Pressure

Hypertension, the most common cardiovascular disease, is diagnosed through repeated measurements of elevated blood pressure. Its risks, including damage to the kidney, heart, and brain, are directly proportional to blood pressure levels. Starting from 115/75 mm Hg, the risk of cardiovascular disease doubles with each increment of 20/10 mm Hg. The diagnosis relies on blood pressure measurements, not on patient symptoms, as hypertension is often asymptomatic until end-organ damage is imminent or...
Hypertension II: Pathophysiology01:29

Hypertension II: Pathophysiology

Hypertension is a chronic condition in which the blood's force against artery walls is excessively high, posing risks such as heart disease. The condition's underlying mechanisms involve complex interactions among the cardiovascular, kidney, and autonomic nervous systems.Renin-Angiotensin-Aldosterone System (RAAS): This system significantly influences blood pressure regulation. When blood pressure decreases, the kidneys secrete renin. This enzyme transforms angiotensinogen, a plasma protein,...
Neural Regulation of Blood Pressure01:18

Neural Regulation of Blood Pressure

The neural regulation of blood pressure involves intricate interactions between the autonomic nervous system (ANS) and cardiovascular system, ensuring adequate perfusion of tissues. This regulation primarily occurs through baroreceptor and chemoreceptor reflexes, involving both short-term and long-term mechanisms.
Baroreceptor Reflex
Baroreceptors, located in the carotid sinuses and aortic arch, detect changes in blood pressure. When blood pressure rises, these stretch-sensitive receptors...
Pathophysiology of Cardiac Performance01:29

Pathophysiology of Cardiac Performance

Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...

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Endogenous ouabain in cardiovascular function and disease.

Paolo Manunta1, Mara Ferrandi, Giuseppe Bianchi

  • 1San Raffaele Scientific Institute, Division of Nephrology, Dialysis, and Hypertension, Universita' Vita-Salute San Raffaele Hospital, Milan, Italy. manunta.paolo@hsr.it

Journal of Hypertension
|December 4, 2008
PubMed
Summary
This summary is machine-generated.

Endogenous ouabain, identified in human plasma, originates from the adrenal glands and influences blood pressure. Its levels are affected by salt intake and volume status, impacting heart and kidney function.

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Area of Science:

  • Biochemistry
  • Cardiovascular Physiology
  • Endocrinology

Background:

  • Endogenous ouabain has been isolated and identified in mammalian tissues, including human plasma.
  • Evidence suggests an adrenal origin for circulating endogenous ouabain.
  • Circulating levels are modulated by dietary salt and chronic volume status.

Purpose of the Study:

  • To review the current understanding of endogenous ouabain's role in human physiology and disease.
  • To highlight the link between endogenous ouabain, hypertension, and heart/renal failure.
  • To identify key areas for future research in its biosynthesis, secretion, and clearance.

Main Methods:

  • Literature review of studies on endogenous ouabain isolation and identification.
  • Analysis of evidence linking endogenous ouabain to vascular function and disease pathogenesis.
  • Discussion of molecular mechanisms involving the sodium pump/sodium-calcium exchange duet.

Main Results:

  • Endogenous ouabain is conclusively identified in human plasma and other mammalian tissues.
  • Adrenal glands are the primary source of circulating endogenous ouabain.
  • Endogenous ouabain significantly impacts vascular function in hypertension and contributes to heart and renal failure.

Conclusions:

  • Endogenous ouabain plays a critical role in cardiovascular homeostasis and disease.
  • The sodium pump/sodium-calcium exchange pathway is central to endogenous ouabain-mediated hypertension.
  • Further research is needed to fully elucidate the biosynthetic pathway and regulatory mechanisms of endogenous ouabain.