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Related Concept Videos

Structure and Organization of Smooth Muscles01:13

Structure and Organization of Smooth Muscles

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Smooth muscle tissue is a type of muscle tissue that can be found lining various vital organs in the human body, including the lungs, blood vessels, digestive tract, and respiratory tract. This type of tissue is responsible for regulating the movements of these organs, playing crucial roles in the functioning of various systems, including the vascular, digestive, respiratory, and urinary systems.
Structure of smooth muscle cell
Smooth muscle cells are spindle-shaped with tapering ends and a...
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Functions of Smooth Muscles01:23

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Smooth muscles are an important type of muscle tissue that plays a vital role in the involuntary movements of internal organs. For example, they help regulate the movement of food through the gut and the flow of blood through the circulatory system.
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Smooth Muscle Contraction01:25

Smooth Muscle Contraction

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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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Connective Tissue Cell Types01:22

Connective Tissue Cell Types

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Connective tissue develops from the mesoderm of a developing embryo and consists of cells, fibers, and ground substance: a gel-like material containing large complexes of carbohydrates and proteins. Connective tissue was first identified as a separate tissue family in the 18th century, and Johannes Peter Muller coined the term connective tissue.
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Renewal of Intestinal Stem Cells

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The intestinal epithelial lining rapidly renews every 4 to 5 days. The renewal is facilitated by intestinal stem cells (ISCs) located at the base of the crypt– a gland located at the bottom of each villus. ISCs divide asymmetrically to form new stem cells and progenitor daughter cells. The daughter cells are called transit-amplifying (TA) cells which move upwards along the crypt and either differentiate into absorptive cells– the enterocytes or secretory cells– including the...
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Regulation of the Digestive System01:25

Regulation of the Digestive System

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Digestive activity regulation hinges on three primary components. Activation is prompted by a multitude of mechanical and chemical indicators, primarily detected by receptors within the stomach and intestines' walls. These receptors predominantly respond to factors such as mechanical stretching of the organ walls, changes in pH and osmolarity, and the presence of digesting materials and their by-products.
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Claims regarding the fidelity of extracellular electrical recording from gastrointestinal muscles not validated suitably.

American journal of physiology. Gastrointestinal and liver physiology·2026
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Related Experiment Video

Updated: Apr 27, 2026

Isolation of Primary Patient-specific Aortic Smooth Muscle Cells and Semiquantitative Real-time Contraction Measurements In Vitro
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Interstitial cells: regulators of smooth muscle function.

Kenton M Sanders1, Sean M Ward1, Sang Don Koh1

  • 1Department of Physiology and Cell Biology, University of Nevada School of Medicine, Reno, Nevada.

Physiological Reviews
|July 3, 2014
PubMed
Summary
This summary is machine-generated.

Interstitial cells, including interstitial cells of Cajal (ICC) and PDGFRα(+) cells, form electrical networks with smooth muscle cells, regulating organ function. Their dysfunction is linked to gastrointestinal motor disorders.

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Area of Science:

  • Physiology
  • Cell Biology
  • Gastroenterology

Background:

  • Smooth muscles comprise diverse cell types beyond muscle cells, including interstitial cells of mesenchymal origin.
  • Interstitial cells form electrical connections with smooth muscle cells, creating functional units like the SIP syncytium.
  • In the gastrointestinal tract, interstitial cells of Cajal (ICC) and PDGFRα(+) cells are well-characterized distinct cell populations.

Purpose of the Study:

  • To review the structural, functional, and molecular characteristics of interstitial cells in smooth muscle tissues.
  • To discuss the roles of interstitial cells in regulating smooth muscle physiology and pathophysiology.
  • To highlight the importance of interstitial cells in integrated smooth muscle function.

Main Methods:

  • Literature review of structural, functional, and molecular data on smooth muscle interstitial cells.
  • Analysis of the role of interstitial cells in electrical coupling and syncytium formation.
  • Examination of the physiological and pathophysiological implications of interstitial cell function.

Main Results:

  • Interstitial cells are electrically coupled to smooth muscle cells, forming integrated SIP syncytia.
  • SIP cells contribute to pacemaker activity, slow wave propagation, neuronal input transduction, and mechanosensitivity.
  • Loss or dysfunction of interstitial cells is associated with smooth muscle motor disorders, particularly in the gut.

Conclusions:

  • Interstitial cells are crucial for the coordinated function of smooth muscle tissues.
  • Understanding interstitial cell biology is essential for addressing smooth muscle-related disorders.
  • Further research is needed to fully define the roles of interstitial cells in various smooth muscle organs.