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Related Concept Videos

Pathophysiology of Cardiac Performance01:29

Pathophysiology of Cardiac Performance

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Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
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The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase...
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Heart Failure II: Pathophysiology01:29

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Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
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Structure of Cardiac Muscles01:13

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Cardiac muscle, or myocardium, is a specialized type of muscle found exclusively in the heart. Its unique structural and functional characteristics enable the heart to perform its vital role of pumping blood throughout the body continuously and rhythmically. The cardiac muscle cells, or cardiomyocytes, possess an endomysium and perimysium but do not have an epimysium.
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Heart failure (HF) is a progressive syndrome involving ventricles that leads to inadequate cardiac output. It can be classified based on location and output or ejection fraction. Ejection fraction (EF) is an essential measurement in the diagnosis and surveillance of HF. Reduced EF corresponds to systolic heart failure (HFrEF). However, HF with preserved ejection fraction (HFpEF) is becoming increasingly prevalent. Also known as diastolic HF, this form of HF is related to aging. The...
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Regulation of Stroke Volume01:27

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The regulation of stroke volume, which is the amount of blood the heart pumps out during each heartbeat, is critical for maintaining a healthy circulatory system. Stroke volume is influenced by three main factors: preload, contractility, and afterload.
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Related Experiment Video

Updated: Dec 20, 2025

En Face Endocardial Cushion Preparation for Planar Morphogenesis Analysis in Mouse Embryos
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Cardiac function modulates endocardial cell dynamics to shape the cardiac outflow tract.

Pragya Sidhwani1, Dena M Leerberg1, Giulia L M Boezio2

  • 1Division of Biological Sciences, University of California, San Diego, La Jolla, CA 92093, USA.

Development (Cambridge, England)
|May 23, 2020
PubMed
Summary

Cardiac function is crucial for outflow tract development. Disrupting heart function halts endocardial growth, impacting cardiac birth defect formation.

Keywords:
Acvrl1Cardiac functionEndocardiumHeart developmentOutflow tractZebrafish

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Area of Science:

  • Developmental Biology
  • Cardiovascular Physiology
  • Biophysics

Background:

  • Physical forces, including contractility and blood flow, significantly influence cellular dynamics during organogenesis.
  • The cardiac outflow tract (OFT) is a vital structure connecting the heart and vasculature, forming during active circulation.

Purpose of the Study:

  • To investigate the interplay between cardiac function and form in the assembly of the cardiac outflow tract.
  • To elucidate how biomechanical cues regulate cell behavior and OFT morphogenesis.

Main Methods:

  • Utilized zebrafish as a model organism to study OFT development.
  • Disrupted cardiac function to observe effects on OFT growth and cellular dynamics.
  • Investigated the role of the flow-responsive TGFβ receptor Acvrl1 in endocardial cell regulation.

Main Results:

  • OFT expansion occurs through the addition of endocardial and myocardial cells.
  • Disruption of cardiac function led to cessation of OFT endocardial growth, reduced cell proliferation, and decreased cell addition from adjacent vessels.
  • Acvrl1 is essential for endocardial cell addition but not proliferation, highlighting distinct function-dependent regulatory mechanisms.

Conclusions:

  • Cardiac function modulates OFT morphogenesis by promoting endocardial cell accumulation, which drives OFT lumen expansion and defines its dimensions.
  • These findings offer new insights into the mechanisms underlying cardiac birth defects and the role of biomechanical forces in development.