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Related Concept Videos

Hormonal Regulation01:33

Hormonal Regulation

The renin-aldosterone system is an endocrine system which guides the renal absorption of water and electrolytes, thus managing blood pressure and osmoregulation. Activation of the system begins in the kidneys with a small cluster of cells adjacent to the afferent and efferent blood vessels of the renal corpuscle. As the nephrons are filtering blood, juxtaglomerular cells monitor blood pressure. If they detect a decrease in pressure, they release the hormone renin into the bloodstream.
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...
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...
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 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,...
Hypertension III: Clinical Manifestations and Diagnostic Studies01:30

Hypertension III: Clinical Manifestations and Diagnostic Studies

Hypertension is asymptomatic and also referred to as the "silent killer" until it progresses to a severe stage or causes target organ disease. Patients may experience symptoms stemming from the strain on blood vessels and tissues in various organs or the heart's increased workload.Physical exams might show no abnormalities other than high blood pressure. Signs of vascular damage, when present, correspond to the organs supplied by the affected vessels, leading to target organ damage. For...

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Related Experiment Video

Updated: Jun 29, 2026

Assessing Murine Resistance Artery Function Using Pressure Myography
07:25

Assessing Murine Resistance Artery Function Using Pressure Myography

Published on: June 7, 2013

Basic research into the mechanisms responsible for postmenopausal hypertension.

Jane F Reckelhoff1

  • 1Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, Mississippi, USA.

International Journal of Clinical Practice. Supplement
|May 1, 2004
PubMed
Summary

Postmenopausal hypertension is a significant risk factor for cardiovascular disease (CVD) in women. The aging female spontaneously hypertensive rat (SHR) offers a new model to study the mechanisms behind this condition.

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Last Updated: Jun 29, 2026

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Area of Science:

  • Endocrinology and cardiovascular science
  • Reproductive biology and aging

Background:

  • Cardiovascular disease (CVD) risk, particularly hypertension, increases in women after menopause.
  • Mechanisms driving postmenopausal hypertension, including hormonal shifts and increased oxidative stress, are not fully understood.
  • A lack of suitable animal models has hindered research into postmenopausal hypertension.

Purpose of the Study:

  • To review potential mechanisms contributing to postmenopausal hypertension.
  • To introduce and characterize the aging female spontaneously hypertensive rat (SHR) as a model for postmenopausal hypertension.

Main Methods:

  • Review of existing literature on hormonal changes, renin-angiotensin system, endothelin, oxidative stress, obesity, type 2 diabetes, and sympathetic nervous system activation in postmenopausal women.
  • Characterization of the aging female SHR for its humoral and physiological similarities to postmenopausal women.

Main Results:

  • The aging female SHR exhibits humoral characteristics mirroring those of postmenopausal women.
  • This model presents a viable tool for investigating the underlying causes of postmenopausal hypertension.

Conclusions:

  • Understanding the mechanisms of postmenopausal hypertension is crucial for CVD prevention in women.
  • The aging female SHR serves as a valuable preclinical model for studying postmenopausal hypertension and testing potential interventions.