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Related Concept Videos

Muscle Contraction01:15

Muscle Contraction

Muscle Contraction01:10

Muscle Contraction

In skeletal muscles, acetylcholine is released by nerve terminals at the motor endplate—the point of synaptic communication between motor neurons and muscle fibers. The binding of acetylcholine to its receptors on the sarcolemma allows entry of sodium ions into the cell and triggers an action potential in the muscle cell. Thus, electrical signals from the brain are transmitted to the muscle. Subsequently, the enzyme acetylcholinesterase breaks down acetylcholine to prevent excessive muscle...
Motor Unit Stimulation01:20

Motor Unit Stimulation

When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
Functions of Smooth Muscles01:23

Functions of Smooth Muscles

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.
Function of visceral smooth muscles
Visceral smooth muscle is found in the walls of all hollow organs, except the heart, and is a key player in the involuntary movements that drive the functioning of these internal organs. This tissue is arranged in...
Fascicle Arrangement in Skeletal Muscles01:25

Fascicle Arrangement in Skeletal Muscles

Fascicles are bundles of muscle fibers in a skeletal muscle. Muscle fascicle arrangement is directly associated with the power and range of motion of various muscles. The configuration of these fascicles can vary, leading to different functional outcomes.
The four primary types of muscle based on fascicle arrangement are:
Smooth Muscle Contraction01:25

Smooth Muscle Contraction

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.
The onset of contraction is triggered by an increase in calcium ions within the sarcoplasm, similar to the process in striated muscle. However, smooth muscles have a relatively smaller reservoir of the sarcoplasmic...

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Related Experiment Video

Updated: Jun 19, 2026

Spatiotemporal Mapping of Motility in Ex Vivo Preparations of the Intestines
12:00

Spatiotemporal Mapping of Motility in Ex Vivo Preparations of the Intestines

Published on: January 28, 2016

Anatomic contribution to differences in rabbit colonic muscle contraction.

W J Snape1, B Crawford, P E Hyman

  • 1Department of Medicine, Harbor-UCLA Medical Center, Torrance.

Gastroenterology
|January 11, 1991
PubMed
Summary

Rabbit colon muscle histology varies by region, impacting contraction force. Distal circular muscle shows greater force, while taenia coli has reduced force due to fewer contracting cells.

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In Vitro Characterization of the Electrophysiological Properties of Colonic Afferent Fibers in Rats
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In Vitro Characterization of the Electrophysiological Properties of Colonic Afferent Fibers in Rats

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Related Experiment Videos

Last Updated: Jun 19, 2026

Spatiotemporal Mapping of Motility in Ex Vivo Preparations of the Intestines
12:00

Spatiotemporal Mapping of Motility in Ex Vivo Preparations of the Intestines

Published on: January 28, 2016

Video Imaging and Spatiotemporal Maps to Analyze Gastrointestinal Motility in Mice
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Video Imaging and Spatiotemporal Maps to Analyze Gastrointestinal Motility in Mice

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In Vitro Characterization of the Electrophysiological Properties of Colonic Afferent Fibers in Rats
08:19

In Vitro Characterization of the Electrophysiological Properties of Colonic Afferent Fibers in Rats

Published on: September 27, 2017

Area of Science:

  • Gastroenterology
  • Comparative Physiology
  • Muscle Biology

Background:

  • Regional differences in colonic muscle force are known.
  • The histological basis for these force variations requires elucidation.

Purpose of the Study:

  • To investigate the association between rabbit colon muscle histology and its force of contraction.
  • To identify histological factors contributing to regional differences in colonic muscle function.

Main Methods:

  • Isolation of circular and longitudinal muscles from proximal and distal rabbit colon.
  • Stimulation of muscle strips to contract and processing for electron microscopy.
  • Histological analysis of muscle cell cross-sections and extracellular matrix.

Main Results:

  • Taenia coli smooth muscle cells exhibited larger perimeters and increased extracellular matrix compared to other colonic sites.
  • Proximal circular muscle cells had smaller perimeters and were more numerous.
  • Distal circular muscle generated greater force than other muscles upon stimulation; taenia coli generated less force.
  • Bethanechol was a less potent stimulant for longitudinal muscles than circular muscles.

Conclusions:

  • Reduced taenia coli contraction efficacy is partly due to a lower number of available muscle cells.
  • Enhanced distal circular muscle stimulation efficacy is an inherent property, not related to muscle mass.