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Related Concept Videos

Specialized Characteristics of Cardiac Muscles01:27

Specialized Characteristics of Cardiac Muscles

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.
Cardiac muscle cells are smaller than skeletal muscles, averaging 10–20 mm in diameter and 50–100 mm in length. However, they have large energy demands for continuous contraction and relaxation. This energy is almost exclusively derived from aerobic metabolism of energy reserves in...
Structure of Cardiac Muscles01:13

Structure of Cardiac Muscles

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.
Compared to skeletal muscles, cardiac muscle cells are small and mostly have a single nucleus. Additionally, they are usually...
Cardiac Action Potential01:30

Cardiac Action Potential

Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials
Cellular Differentiation00:57

Cellular Differentiation

How does a complex organism such as a human develop from a single cell? It all starts from a single fertilized egg which gives rise to a vast array of cell types, such as nerve cells, muscle cells, and epithelial cells that characterize the adult? Throughout development and adulthood, cellular differentiation leads cells to assume their final morphology and physiology. Differentiation is the process by which unspecialized cells become specialized to carry out distinct functions.
A zygote is a...
Formation of Muscle Fibers from Myoblasts01:13

Formation of Muscle Fibers from Myoblasts

De novo myogenesis, or the formation of muscle fibers, begins during the early embryonic stages. The skeletal muscle is formed from somites– blocks of embryonic cell layers. The somites are further divided into dermatomes, myotomes, sclerotomes, and syndetomes. Among these, the myotomes give rise to muscle fibers.
Muscle progenitor cells (MPCs) are formed from the myotomes. MPCs express genes that encode the transcription factors Pax3 and Pax7. Along with Pax 3/7, other transcription factors...
Forced Transdifferentiation01:28

Forced Transdifferentiation

Transdifferentiation, also known as lineage reprogramming, was first discovered by Selman and Kafatos in 1974 in silkmoths. They observed that the moths’ cuticle-producing cells transformed into salt-producing cells. Many such cases of natural transdifferentiation occur in organisms. In humans, pancreatic alpha cells can become beta cells. In newts, the loss of the eye’s lens causes the pigmented epithelial cells to transdifferentiate into the lens cells.
Artificial transdifferentiation occurs...

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Related Experiment Video

Updated: Jun 15, 2026

Analysis of Cardiomyocyte Development using Immunofluorescence in Embryonic Mouse Heart
10:56

Analysis of Cardiomyocyte Development using Immunofluorescence in Embryonic Mouse Heart

Published on: March 26, 2015

Cardiac myocyte force development during differentiation and maturation.

Jeffrey G Jacot1, Hiroko Kita-Matsuo, Karen A Wei

  • 1Department of Bioengineering, Rice University, and Division of Congenital Heart Surgery, Texas Children's Hospital, Houston, Texas, USA.

Annals of the New York Academy of Sciences
|March 6, 2010
PubMed
Summary
This summary is machine-generated.

Extracellular matrix stiffness influences cardiac myocyte development. Optimal stiffness promotes aligned sarcomeres and greater force generation in developing heart cells, impacting maturation and differentiation.

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Micropatterned Magneto-Rheological Elastomers to Drive Changes in Cardiomyocyte Alignment
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Analysis of Cardiomyocyte Development using Immunofluorescence in Embryonic Mouse Heart
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Analysis of Cardiomyocyte Development using Immunofluorescence in Embryonic Mouse Heart

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Micropatterned Magneto-Rheological Elastomers to Drive Changes in Cardiomyocyte Alignment

Published on: June 10, 2025

Area of Science:

  • Biomedical Engineering
  • Cardiovascular Biology
  • Developmental Biology

Background:

  • Cardiac myocyte maturation occurs during the prenatal period.
  • This maturation process is associated with changes in the mechanical properties of the extracellular matrix.

Purpose of the Study:

  • To investigate the effects of extracellular matrix stiffness on cardiomyocyte maturation and differentiation.
  • To determine the optimal stiffness for cardiomyocyte mechanical function.

Main Methods:

  • Neonatal rat ventricular myocytes were cultured on collagen-coated gels of varying stiffness (e.g., 10 kPa).
  • Engineered human embryonic stem cells were used for clonal expansion to study myocyte progenitor differentiation.
  • Gene expression profiles, sarcomere alignment, stress fiber formation, mechanical force generation, and action potentials were analyzed.

Main Results:

  • Cells cultured on 10-kPa substrates showed aligned sarcomeres, while stiffer substrates led to unaligned sarcomeres and stress fibers.
  • Cardiomyocytes generated maximal mechanical force on substrates with stiffness similar to the native myocardium.
  • Puromycin-selected cardiomyocytes derived from engineered stem cells displayed adult-like gene expression and fetal-like functional properties.

Conclusions:

  • Extracellular matrix stiffness is a critical factor influencing the maturation and differentiation of immature ventricular myocytes.
  • Mechanical cues from the extracellular environment play a significant role in cardiac development and function.