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Regulation of Heart Rates

Regulation of Heart Rates

The regulation of heart rate is a complex process controlled by the autonomic nervous system (ANS), hormonal influences, and intrinsic cardiac mechanisms. The ANS has two main components: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS).
The SNS increases heart rate through the release of norepinephrine and epinephrine, which act on beta-1 adrenergic receptors in the heart. This action increases the rate of depolarization in the sinoatrial (SA) node, the heart's...

Regulation of the Cardiovascular System

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.
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Factors Influencing Heart Rate

Factors Influencing Heart Rate

The heart rate, or pulse rate, is a vital indicator of cardiovascular health. It reflects the number of times the heart beats per minute. Various physiological and environmental factors influence heart rate, increasing or decreasing cardiac output. Understanding these factors is crucial for assessing heart function and identifying potential health issues.
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Adrenergic Neurons: Neurotransmission

Adrenergic Neurons: Neurotransmission

Postganglionic sympathetic fibers (except those supplying the sweat glands) releasing noradrenaline or norepinephrine are called noradrenergic or adrenergic neurons. Noradrenaline, dopamine, adrenaline, or epinephrine are collectively called "catecholamines" as they contain a catechol moiety and an amine side chain. The five stages of neurotransmitter release involve their synthesis, storage, release, reuptake and metabolism.
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Drugs Affecting Neurotransmitter Release or Uptake

Drugs Affecting Neurotransmitter Release or Uptake

Certain drugs can affect how neurotransmitters called catecholamines, are released or taken back up in the adrenergic neuron. They can have different effects on the body's sympathetic transmission. Reserpine, a natural compound found in the Rauwolfia shrub, blocks a transporter called vesicular monoamine transporter (VMAT), which leads to a buildup of catecholamines in the cell and reduces sympathetic transmission. Another drug called guanethidine works in multiple ways, including blocking...

Hormonal Regulation of Blood Pressure

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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
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Related Experiment Video

Updated: Jun 27, 2026

A Plate-Based Assay for the Measurement of Endogenous Monoamine Release in Acute Brain Slices

A Plate-Based Assay for the Measurement of Endogenous Monoamine Release in Acute Brain Slices

Published on: August 11, 2021

5-hydroxytryptamine and cardiovascular regulation.

Andrew G Ramage¹, Carlos M Villalón

¹Department of Pharmacology, University College London, Gower Street, London, WC1E 6BT, UK. a.ramage@ucl.ac.uk

Trends in Pharmacological Sciences

|December 17, 2008

Summary

Serotonin (5-hydroxytryptamine or 5-HT) receptors regulate cardiovascular function. Central 5-HT1A, 5-HT3, and 5-HT7 receptors control heart reflexes, while 5-HT2 receptors influence blood pressure.

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Published on: September 21, 2021

Area of Science:

Cardiovascular physiology
Neuropharmacology
Serotonin receptor function

Background:

Serotonin (5-hydroxytryptamine, 5-HT) receptors are implicated in cardiovascular regulation, with exceptions like the 5-HT6 type.
The precise role of peripheral 5-HT in vascular tone, distinct from coagulation, requires further elucidation.
Central 5-HT1A, 5-HT3, and 5-HT7 receptors are known to modulate cardiovascular reflexes and parasympathetic (vagal) drive to the heart.

Purpose of the Study:

To investigate the physiological roles of various serotonin receptors in the central regulation of cardiovascular function.
To clarify the involvement of central 5-HT receptors in sympathetic nervous system activity and blood pressure control.
To explore the potential role of 5-HT2 receptors in deoxycorticosterone-acetate-salt hypertension and vasopressin release.

Main Methods:

Review and synthesis of existing literature on serotonin receptor function in cardiovascular regulation.
Analysis of studies examining the effects of central 5-HT receptor activation/inhibition on cardiovascular parameters.
Investigation into the link between 5-HT2 receptor activity and hypertension models.

Main Results:

Central 5-HT1A receptors inhibit sympathetic activity, leading to decreased blood pressure.
Central 5-HT2 receptors stimulate sympathetic activity, causing increased blood pressure.
Central 5-HT1A, 5-HT3, and 5-HT7 receptors are confirmed to physiologically regulate cardiovascular reflexes and vagal drive.
5-HT2 receptors may contribute to deoxycorticosterone-acetate-salt hypertension, potentially via vasopressin release control.

Conclusions:

Specific central serotonin receptors (5-HT1A, 5-HT2, 5-HT3, 5-HT7) play significant physiological roles in modulating sympathetic nervous system activity and blood pressure.
Further research is needed to fully understand the complex mechanisms underlying serotonin's influence on vascular tone and hypertension development.