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Hormonal Regulation

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.

Antihypertensive Drugs: Direct Renin Inhibitors

Antihypertensive Drugs: Direct Renin Inhibitors

The renin-angiotensin-aldosterone system (RAAS) is an intricate physiological pathway involving numerous enzymes and hormones, including renin, angiotensin-converting enzyme (ACE), angiotensin I and II, and aldosterone. Imbalances within this system increase the production of angiotensin II and aldosterone. Increased angiotensin II levels promote vasoconstriction and blood pressure elevation. Concurrently, higher aldosterone levels stimulate sodium and water reabsorption in the kidneys,...

Adrenergic Antagonists: ɑ and β-Receptor Blockers

Adrenergic Antagonists: ɑ and β-Receptor Blockers

Third-generation β-blockers, such as labetalol and carvedilol, represent a significant advancement in managing cardiovascular conditions. Unlike conventional β-blockers, which can induce peripheral vasoconstriction, third-generation drugs block α1 adrenoceptors. This promotes vasodilation through several mechanisms, such as increased nitric oxide production, inhibition of calcium ion entry, opening of potassium ion channels, and antioxidant action. Labetalol, for instance, is clinically...

Antihypertensive Drugs: Angiotensin-Converting Enzyme Inhibitors

Antihypertensive Drugs: Angiotensin-Converting Enzyme Inhibitors

Angiotensin-converting enzyme (ACE), a vital component of the renin-angiotensin-aldosterone system, is abundant in lung endothelial cells. ACE converts the inactive decapeptide, angiotensin I, into the active octapeptide, angiotensin II. This potent vasoconstrictor narrows blood vessels, increasing resistance to blood flow and elevating blood pressure. Angiotensin II also stimulates aldosterone production, encouraging kidney cells to reabsorb more sodium and water from urine, thereby increasing...

Regulation of Sodium and Potassium

Regulation of Sodium and Potassium

The regulation of sodium and potassium ion concentrations in the human body is a complex process governed primarily by hormones such as aldosterone, antidiuretic hormone (ADH), and atrial natriuretic peptide (ANP).
Sodium Regulation
Sodium ions make up approximately 90% of extracellular cations, with a normal blood plasma concentration of 136–148 mEq/L. A decrease in blood volume and pressure triggers the release of renin from granular cells in the juxtaglomerular complex (JGC), primarily in...

Hormonal Regulation of Blood Pressure

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.
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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...

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Related Experiment Video

Updated: May 21, 2026

The 4-vessel Sampling Approach to Integrative Studies of Human Placental Physiology In Vivo

The 4-vessel Sampling Approach to Integrative Studies of Human Placental Physiology In Vivo

Published on: August 2, 2017

Plasma aldosterone concentration and plasma renin activity decrease during the third trimester in women with twin

Takahiro Koyama¹, Takashi Yamada, Itsuko Furuta

¹Department of Obstetrics, Hokkaido University Graduate School of Medicine, Sapporo, Japan.

Hypertension in Pregnancy

|June 9, 2012

Summary

Plasma aldosterone concentration (PAC) and plasma renin activity (PRA) are elevated in early twin pregnancies but decrease later. These hormonal changes in twin pregnancies differ from normal singleton pregnancies.

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Accurate and Simple Evaluation of Vascular Anastomoses in Monochorionic Placenta using Colored Dye

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Last Updated: May 21, 2026

The 4-vessel Sampling Approach to Integrative Studies of Human Placental Physiology In Vivo

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Published on: August 2, 2017

Accurate and Simple Evaluation of Vascular Anastomoses in Monochorionic Placenta using Colored Dye

Accurate and Simple Evaluation of Vascular Anastomoses in Monochorionic Placenta using Colored Dye

Published on: September 5, 2011

Area of Science:

Reproductive endocrinology
Maternal-fetal medicine
Renal physiology

Background:

Plasma aldosterone concentration (PAC) and plasma renin activity (PRA) roles in pregnancy are complex.
Limited data exists on PAC and PRA dynamics in twin pregnancies.

Purpose of the Study:

To investigate changes in PAC and PRA during twin pregnancies.
To compare these changes with those observed in singleton pregnancies (normotensive and preeclamptic).

Main Methods:

PAC and PRA levels were measured in 14 women with twin pregnancies.
Measurements were taken during the second and third trimesters and postpartum day 3.
Data was compared to 80 normotensive and 7 preeclamptic women with singleton pregnancies.

Main Results:

Women with twin pregnancies showed elevated PAC and PRA in the second trimester, significantly decreasing by the third trimester.
In contrast, women with normal singleton pregnancies had increasing PAC and stable PRA during the same period.
PAC and PRA changes in twin pregnancies mirrored those seen in hypertensive singleton pregnancies.

Conclusions:

Twin pregnancies exhibit significantly enhanced PAC and PRA in the second trimester, with a significant reduction in the third trimester compared to normal singleton pregnancies.
These findings suggest distinct hormonal adaptations in twin pregnancies.