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Related Concept Videos

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...
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...
Regulation of Heart Rates01:31

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...
Sympathetic Activation01:16

Sympathetic Activation

The sympathetic division can influence tissues and organs by releasing norepinephrine at peripheral synapses and distributing epinephrine and norepinephrine through the bloodstream. In times of crisis or stress, sympathetic activation occurs, which is regulated by sympathetic centers in the hypothalamus. As a result, sympathetic activation prepares the body for physical exertion, rapid ATP production, and heightened alertness, allowing individuals to respond effectively to challenging or...
Brainstem: Control Centers of Medulla01:21

Brainstem: Control Centers of Medulla

The medulla oblongata is a crucial part of the brainstem responsible for controlling various autonomic and involuntary functions. It contains several nuclei, including the olivary, cuneate, gracile, and solitary nuclei.
Olivary Nucleus
The olivary nucleus, or inferior olivary nucleus, is located within the ventrolateral part of the medulla oblongata. It is primarily involved in motor coordination and motor learning. The olivary nucleus receives input from the spinal cord, cerebellum, and motor...
Sympathetic Pathways: Collateral Ganglia and Adrenal Medulla01:27

Sympathetic Pathways: Collateral Ganglia and Adrenal Medulla

The sympathetic pathways of the collateral ganglia and adrenal medulla serve unique but interconnected roles in the sympathetic response.
Collateral Ganglia
Sympathetic preganglionic axons reach the collateral ganglia along the route of splanchnic nerves. These nerves bypass the sympathetic trunk and communicate with sympathetic postganglionic neurons housed in the prevertebral ganglia. These ganglia supply the organs of the abdominopelvic cavity.
The greater splanchnic nerve, formed by the...

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Related Experiment Video

Updated: Jul 16, 2026

Implantation of Combined Telemetric ECG and Blood Pressure Transmitters to Determine Spontaneous Baroreflex Sensitivity in Conscious Mice
09:56

Implantation of Combined Telemetric ECG and Blood Pressure Transmitters to Determine Spontaneous Baroreflex Sensitivity in Conscious Mice

Published on: February 14, 2021

Forebrain regions associated with postexercise differences in autonomic and cardiovascular function during

D S Kimmerly1, S W Wong, D Salzer

  • 1Neurovascular Research Laboratory, Faculty of Health Sciences and School of Kinesiology, The University of Western Ontario, London, Ontario, Canada.

American Journal of Physiology. Heart and Circulatory Physiology
|March 14, 2007
PubMed
Summary

Dynamic exercise alters autonomic responses to lower body negative pressure (LBNP). Post-exercise, the brain

Related Experiment Videos

Last Updated: Jul 16, 2026

Implantation of Combined Telemetric ECG and Blood Pressure Transmitters to Determine Spontaneous Baroreflex Sensitivity in Conscious Mice
09:56

Implantation of Combined Telemetric ECG and Blood Pressure Transmitters to Determine Spontaneous Baroreflex Sensitivity in Conscious Mice

Published on: February 14, 2021

Area of Science:

  • Neuroscience
  • Autonomic Physiology
  • Cardiovascular Regulation

Background:

  • The neural control of autonomic reactions, particularly concerning cardiovascular responses to stress, remains incompletely understood.
  • Investigating the role of the forebrain in modulating autonomic and cardiovascular adjustments is crucial for understanding human physiological regulation.

Purpose of the Study:

  • To examine how forebrain activity changes in response to altered physiological responses during lower body negative pressure (LBNP) after dynamic exercise.
  • To test the hypothesis that post-exercise conditions (POST-EX) would amplify cardiovascular and sympathetic nerve responses to LBNP compared to a non-exercised state (NO-EX).

Main Methods:

  • Utilized blood oxygen-level-dependent (BOLD) functional magnetic resonance imaging (fMRI) to measure forebrain neural activity in 11 participants.
  • Collected physiological data including heart rate (HR), stroke volume (SV), arterial blood pressure (ABP), and muscle sympathetic nerve activity (MSNA).
  • Applied lower body negative pressure (LBNP) at 5, 15, and 35 mmHg under both POST-EX and NO-EX conditions.

Main Results:

  • POST-EX exhibited reduced baseline arterial blood pressure (ABP) and elevated baseline heart rate (HR) and total vascular conductance (TVC) compared to NO-EX.
  • At 35 mmHg LBNP, POST-EX showed significantly greater increases in HR and muscle sympathetic nerve activity (MSNA) alongside larger decreases in SV and TVC than NO-EX.
  • Specific forebrain regions, including the right posterior insula and dorsal anterior cingulate cortex, displayed distinct BOLD activity patterns under POST-EX LBNP conditions compared to NO-EX.

Conclusions:

  • Forebrain regions, notably the posterior insula and dorsal anterior cingulate cortex, are implicated in the baroreflex-mediated sympathetic and cardiovascular adjustments during LBNP.
  • Dynamic exercise potentiates autonomic and cardiovascular responses to LBNP, suggesting altered central processing of baroreceptor afferents.
  • These findings highlight the complex interplay between exercise, central neural circuits, and autonomic control of the cardiovascular system.