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Related Concept Videos

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...
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...
Isotonic and Isometric Muscle Contractions01:22

Isotonic and Isometric Muscle Contractions

Two primary types of muscle contractions are isotonic and isometric, each serving unique functions and involving distinct mechanisms. Both isotonic and isometric contractions are integral to the body's complex system of movement and stability. Isotonic exercises contribute significantly to functional strength and movement, while isometric contractions are crucial for maintaining posture and joint stability.
Isotonic contractions
Isotonic contractions occur when a muscle changes length while the...
Excitation-Contraction Coupling in Skeletal Muscles01:20

Excitation-Contraction Coupling in Skeletal Muscles

Excitation-contraction coupling is a series of events that occur between generating an action potential and initiating a muscle contraction. It occurs at the triad, a structure found in skeletal muscle fibers that comprise a T-tubule and terminal cisternae of the sarcoplasmic reticulum on each side. These triads are visible in longitudinally sectioned muscle fibers. They are typically located at the A-I junction — the junction between the A and I bands of the sarcomere.
When an action potential...
Actin and Myosin in Muscle Contraction01:16

Actin and Myosin in Muscle Contraction

Actin and myosin are contractile proteins that form the sarcomere found in skeletal muscle tissues for regulating muscle contraction. Actin, a globular contractile protein, interacts with myosin for muscle contraction. The skeletal tissue appears striped or striated under a microscope due to the repeated arrangement of contractile proteins actin and myosin along the length of myofibrils. Dark A bands and light I bands repeat along myofibrils, and the alignment of myofibrils in the cell causes...

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Related Experiment Video

Updated: Jul 4, 2026

In Vivo Canine Muscle Function Assay
09:34

In Vivo Canine Muscle Function Assay

Published on: April 5, 2011

Muscle cocontraction following dynamics learning.

Mohammad Darainy1, David J Ostry

  • 1Department of Psychology, McGill University, 1205 Dr. Penfield Avenue, Montreal, QC, Canada, H3A 1B1.

Experimental Brain Research
|June 28, 2008
PubMed
Summary
This summary is machine-generated.

The nervous system extensively uses muscle coactivation for movement control, even after extensive training. This muscle cocontraction is crucial for regulating movement across different tasks and loads.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Biomechanics

Background:

  • Muscle coactivation is observed in motor learning, unstable environments, and pathologies.
  • Previous understanding suggested coactivation was primarily a transient or pathological phenomenon.

Purpose of the Study:

  • To investigate the extent and role of muscle coactivation in motor control.
  • To determine if coactivation patterns adapt to task-specific demands and external loads.

Main Methods:

  • Examined changes in muscle cocontraction following dynamics learning.
  • Assessed cocontraction across different movement directions and external load strengths.
  • Analyzed electromyographic (EMG) data after extensive motor training.

Main Results:

  • Muscle cocontraction varies systematically with movement direction and external load.
  • The proportion of muscle activity from cocontraction remains constant despite training.
  • Significant cocontraction persists even when motor learning reaches its peak.

Conclusions:

  • Muscle cocontraction is a fundamental and persistent strategy for motor regulation by the nervous system.
  • Task-specific requirements, including load, dictate cocontraction patterns.
  • Coactivation is integral to movement control, not just an early learning or pathological feature.