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Related Concept Videos

Specialized Characteristics of Cardiac Muscles01:27

Specialized Characteristics of Cardiac Muscles

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The primary role of cardiac muscles is to propel blood throughout the cardiovascular system. The cardiac muscle cells, or cardiomyocytes, exhibit specialized characteristics that allow them to perform this function.
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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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Smooth muscle contraction is a complex process vital for various bodily functions, from maintaining blood vessel tension to facilitating the movement of food through the digestive tract. Unlike striated muscles, smooth muscle contraction begins more slowly and lasts longer.
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Actin and myosin or actomyosin filaments also play a significant role in cells other than those involved in muscle contraction (which occurs within the sarcomere of muscle cells). The mechanism of non-muscle cell contractile bundles was first observed in Dictyostelium and Acanthamoeba. In non-muscle cells, two bundles are commonly found: stress fibers and actomyosin adherence belts. These contractile bundles are smaller and less organized than the ones found in muscle cells. They  are held...
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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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Emergent Global Contractile Force in Cardiac Tissues.

Meghan B Knight1, Nancy K Drew2, Linda A McCarthy1

  • 1Department of Biomedical Engineering, University of California-Irvine, Irvine, California; Center for Complex Biological Systems, University of California-Irvine, Irvine, California.

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Researchers developed a novel tool to separate tissue organization from downstream effects in engineered heart tissues. This advances understanding of how structure impacts function for better cardiac therapies.

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Area of Science:

  • Biomedical Engineering
  • Cardiac Tissue Engineering
  • Cardiovascular Research

Background:

  • Current in vitro cardiac tissues lack the structural complexity to fully replicate in vivo function for therapeutic and cardiotoxicity studies.
  • Understanding the downstream effects of cardiac tissue organization, such as gene expression changes, is crucial but currently limited.

Purpose of the Study:

  • To develop and validate a novel in vitro tool to decouple and quantify the contributions of tissue organization and downstream effects on engineered cardiac tissue function.
  • To investigate the relationship between myofibril organization and force generation in cardiac tissues.

Main Methods:

  • Designed cardiac tissue monolayers into a parquet pattern for controlled local and global anisotropic organization.
  • Utilized parquet tissues and heart-on-a-chip devices to experimentally test hypotheses.
  • Developed a quantitative tool to estimate stress production changes independent of tissue architecture.

Main Results:

  • Validated the hypothesis that force and organization can be modeled as a sum of force vectors when downstream effects are minimal.
  • Gained insight into the relationship between generated stress and global myofibril organization.
  • Demonstrated the quantitative tool's ability to estimate stress changes due to downstream effects, separate from architecture.

Conclusions:

  • The developed tool successfully decouples organization and downstream effects in engineered cardiac tissues.
  • Provides a method to elucidate properties linked to tissue architecture that influence force production and pumping function.
  • Offers potential for improved cardiac therapies and cardiotoxicity studies using more accurate in vitro models.