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Related Concept Videos

Tissues01:18

Tissues

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Cells with similar structure and function are grouped into tissues. A group of tissues with a specialized function is called an organ. There are four main types of tissue in vertebrates: epithelial, connective, muscle, and nervous.
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Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

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Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...
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Cardiac Output I:Effect of Heart Rate on Cardiac Output01:19

Cardiac Output I:Effect of Heart Rate on Cardiac Output

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Cardiac Output
Cardiac output (CO) refers to the total amount of blood ejected by one of the ventricles in liters per minute (L/min). In a resting adult, CO ranges from 5 to 6 L/min, adjusting according to the body's metabolic requirements.
Effect of Heart Rate on Cardiac Output
Cardiac output adapts to metabolic demands during stress, physical activity, or illness. The autonomic nervous system regulates heart rate via the sinoatrial node. The parasympathetic nervous system decreases heart...
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The Cardiac Cycle01:13

The Cardiac Cycle

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The heart beats rhythmically in a sequence called the cardiac cycle—a rapid coordination of contraction (systole) and relaxation (diastole).
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Electrical signals—sent from the sinoatrial (SA) node in the right atrial wall to the atrioventricular (AV) node between the right atrium and right ventricle—cause both atria to simultaneously contract. When the signal reaches the AV node, it pauses for approximately a tenth of a second, allowing the atria to contract and...
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Cardiac Cycle01:29

Cardiac Cycle

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The cardiac cycle refers to the sequence of events that occur in the heart from the beginning of one heartbeat to the next. It's characterized by alternating periods of contraction (systole) and relaxation (diastole) of the heart muscles.
During the cardiac cycle, blood flow through the heart is regulated entirely by changing pressure gradients. This sequence of events begins with the heart in a state of total relaxation, known as mid-to-late diastole, during which blood passively flows from...
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Exercise and Cardiac Output01:17

Exercise and Cardiac Output

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Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
Sustained exercise increases the muscles' oxygen demand, which can be...
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Related Experiment Video

Updated: Feb 5, 2026

A Net Mold-based Method of Scaffold-free Three-Dimensional Cardiac Tissue Creation
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A Net Mold-based Method of Scaffold-free Three-Dimensional Cardiac Tissue Creation

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Whole Cardiac Tissue Bioscaffolds.

Karis R Tang-Quan1,2, Nicole A Mehta1, Luiz C Sampaio2

  • 1College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX, USA.

Advances in Experimental Medicine and Biology
|September 22, 2018
PubMed
Summary

Cardiac tissue engineering uses decellularized extracellular matrix (ECM) as bioscaffolds for heart repair. Advances in decellularization and recellularization techniques show promise for treating heart conditions.

Keywords:
Cardiac extracellular matrixCardiac patchesDecellularizationHeart valvesHydrogelsRecellularization

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Last Updated: Feb 5, 2026

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Tissue Engineering

Background:

  • Bioscaffolds are crucial for tissue and organ development, including the heart.
  • Decellularized cardiac tissue, or extracellular matrix (ECM), serves as a promising cardiac bioscaffold.
  • Whole-heart tissue engineering has advanced significantly since 2008, with decellularized cardiac tissue retaining native architecture and biochemistry post-recellularization.

Purpose of the Study:

  • To review advances in decellularization and recellularization of cardiac ECM bioscaffolds.
  • To discuss the potential clinical applications of these cardiac bioscaffolds.

Main Methods:

  • Decellularization methods (chemical, enzymatic, physical) to create cell-free ECM, with a standard of <50 ng/mg double-stranded DNA.
  • Recellularization techniques including perfusion, injection, or combined methods to repopulate the scaffold with cells.
  • Utilizing endothelial cells for vascular lining and cardiomyocytes/parenchymal cells for myocardium.

Main Results:

  • Decellularized cardiac ECM retains native architecture and biochemistry.
  • Recellularization strategies are being refined, though uniform cell distribution in large models remains a challenge.
  • New technologies like bioprinting and hydrogel patches are emerging for cardiac ECM scaffolds.

Conclusions:

  • Recellularized cardiac ECM bioscaffolds offer therapeutic potential for heart failure, valve replacement, and myocardial infarction.
  • Ongoing research focuses on optimizing cell seeding and retention for whole-heart applications.
  • Cardiac ECM bioscaffolds represent a significant advancement in regenerative medicine for cardiovascular therapies.