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Major Hormones and Their Functions

Major Hormones and Their Functions

Hormones, the biochemical messengers produced by endocrine glands, are pivotal in regulating bodily functions and maintaining homeostasis. Each hormone's balance is crucial; imbalances can lead to significant physiological disruptions. Major hormones include oxytocin, cortisol, epinephrine, estrogen, testosterone, thyroxine, growth hormone, insulin, and glucagon.
Oxytocin, produced in the hypothalamus and released by the pituitary gland, plays a role in social bonding, childbirth, and lactation.

Target Cell Response to Hormones

Target Cell Response to Hormones

Hormones intricately bind to receptors on the surface or within target cells, initiating a cascade of cellular responses.
Notably, the cellular response can be regulated by altering the number of receptors expressed in the cell. For example, prolonged exposure to elevated hormone levels results in a gradual decline or down-regulation in the number of receptors for that specific hormone on the cell surface. Conversely, in response to low hormone levels, cells may use up-regulation, producing an...

Secondary Messengers in Hormone Action

Secondary Messengers in Hormone Action

Water-soluble hormones cannot cross the plasma membrane, so they rely on protein receptors that span the membrane to trigger intracellular signaling pathways. These pathways then activate second messengers inside the cell, including cAMP or calcium ions.
Many hormones bind to transmembrane G protein-coupled receptors that connect to regulatory G proteins. These G proteins can then activate enzymes such as adenylyl cyclase or phospholipase C. Adenylyl cyclase converts ATP to cAMP, activating...

Types of Hormones

Types of Hormones

Hormones are classified into four main groups: steroids, eicosanoids, amino acid-based derivatives, and peptide hormones.
Steroids and eicosanoids fall under the category of lipid-soluble hormones. Steroids are derived from cholesterol and feature four interconnected carbon rings with variable side chains. Notable examples include estradiol from ovaries and testosterone from testes, exemplifying the critical roles of these lipid-soluble hormones in reproductive physiology. Eicosanoids, derived...

Types of Hormones

Types of Hormones

Hormones can be classified into three main types based on their chemical structures: steroids, peptides, and amines. Their actions are mediated by the specific receptors they bind to on target cells.

Hormonal Regulation of the Menstrual Cycle

Hormonal Regulation of the Menstrual Cycle

The ovarian cycle regulates endometrial changes throughout a single menstrual cycle via the coordinated action of gonadotrophin-releasing hormone (GnRH) and gonadotrophins.
At puberty, GnRH begins a pulsatile release pattern, which triggers the anterior pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). The frequency and amplitude of GnRH pulses vary across the menstrual cycle, with faster pulses favoring LH release and slower pulses favoring FSH release.

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Related Experiment Video

Updated: Jul 4, 2026

An In Vivo Estrogen Deficiency Mouse Model for Screening Exogenous Estrogen Treatments of Cardiovascular Dysfunction After Menopause

An In Vivo Estrogen Deficiency Mouse Model for Screening Exogenous Estrogen Treatments of Cardiovascular Dysfunction After Menopause

Published on: August 13, 2019

Vascular actions of estrogens: functional implications.

Virginia M Miller¹, Sue P Duckles

¹Surgery and Physiology, Mayo Clinic College of Medicine, Rochester, MN 55905, USA. miller.virginia@mayo.edu

Pharmacological Reviews

|June 27, 2008

Summary

Estrogen

Area of Science:

Cardiovascular Physiology
Endocrinology
Mitochondrial Biology

Background:

Estrogen's role in cardiovascular disease prevention and treatment remains debated.
Estrogen significantly influences vascular physiology and pathophysiology.
Understanding these effects has potential therapeutic implications.

Purpose of the Study:

To comprehensively review the vascular effects of estrogen in humans and experimental animals.
To integrate current knowledge on estrogen synthesis, receptors, and mechanisms of action relevant to the vasculature.
To explore emerging concepts in estrogen therapy for cardiovascular health.

Main Methods:

Literature review integrating human and animal studies.
Analysis of estrogen's impact on mitochondrial function and reactive oxygen species.

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Imaging of Estrogen Receptor-α in Rat Pial Arterioles using a Digital Immunofluorescent Microscope

Imaging of Estrogen Receptor-α in Rat Pial Arterioles using a Digital Immunofluorescent Microscope

Published on: November 29, 2011

Ovariectomy and 17β-estradiol Replacement in Rats and Mice: A Visual Demonstration

Ovariectomy and 17β-estradiol Replacement in Rats and Mice: A Visual Demonstration

Published on: June 7, 2012

Related Experiment Videos

Last Updated: Jul 4, 2026

An In Vivo Estrogen Deficiency Mouse Model for Screening Exogenous Estrogen Treatments of Cardiovascular Dysfunction After Menopause

An In Vivo Estrogen Deficiency Mouse Model for Screening Exogenous Estrogen Treatments of Cardiovascular Dysfunction After Menopause

Published on: August 13, 2019

Imaging of Estrogen Receptor-α in Rat Pial Arterioles using a Digital Immunofluorescent Microscope

Imaging of Estrogen Receptor-α in Rat Pial Arterioles using a Digital Immunofluorescent Microscope

Published on: November 29, 2011

Ovariectomy and 17β-estradiol Replacement in Rats and Mice: A Visual Demonstration

Ovariectomy and 17β-estradiol Replacement in Rats and Mice: A Visual Demonstration

Published on: June 7, 2012

Examination of estrogen's effects on endothelial function, angiogenesis, and autonomic control.

Review of estrogen's role in cardiovascular pathologies like atherosclerosis and stroke.

Main Results:

Estrogen may contribute to women's longer lifespan by reducing mitochondrial reactive oxygen species.
Estrogen enhances endothelial vasodilator function and promotes angiogenesis.
Estrogen influences autonomic function and impacts cardiovascular disease pathways.

Conclusions:

Estrogen exerts multifaceted vascular effects with therapeutic potential.
Factors like formulation, route, timing, and genetic variations influence estrogen's efficacy.
Further research is needed to clarify controversial aspects and optimize estrogen-based therapies.