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Related Concept Videos

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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.
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Myosins are multimeric motor proteins involved in various cellular processes such as migration, adhesion, and proliferation. Myosin II is the most common type in animal cells, which binds and cross-links actin filaments.
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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: Dec 21, 2025

Kinematics and Ground Reaction Force Determination: A Demonstration Quantifying Locomotor Abilities of Young Adult, Middle-aged, and Geriatric Rats
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Reaction Forces and Rib Function During Locomotion in Snakes.

John G Capano1

  • 1Department of Ecology and Evolutionary Biology, Brown University, Providence, RI 02912, USA.

Integrative and Comparative Biology
|May 13, 2020
PubMed
Summary

Snakes achieve forward locomotion using their skin and ribs to generate friction and control forces, unlike limbed animals. Their unique rib joint structure aids in managing these forces for versatile movement.

Area of Science:

  • Biomechanics
  • Vertebrate Zoology
  • Evolutionary Morphology

Background:

  • Tetrapod locomotion relies on limb-ground interactions for force generation.
  • Snakes, lacking limbs, must utilize their axial musculoskeletal system for all propulsive forces.
  • Understanding snake locomotion offers insights into evolutionary adaptations for movement.

Purpose of the Study:

  • To investigate the biomechanical roles of the integument and ribs in snake locomotion.
  • To analyze the unique costovertebral joint morphology in snakes.
  • To elucidate the mechanisms behind snakes' diverse locomotor capabilities.

Main Methods:

  • Analysis of ground-reaction forces (vertical, horizontal, mediolateral).
  • Examination of integumentary properties (scale stiffness, orientation).

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  • X-ray Reconstruction of Moving Morbidity (XROMM) to study rib and body dynamics.
  • Comparative morphological analysis of costovertebral joints.

    • Main Results:

    • Snakes generate propulsive forces primarily through their axial system, integument, and ribs.
    • The integument provides a friction-reservoir modulated by scale properties.
    • Serially repeated ribs deform, stabilize, and transmit forces, with unique biarticular costovertebral joints potentially buttressing forces and resisting reaction forces.

    Conclusions:

    • Snake locomotion is a unique system relying on body-environment interactions, particularly integument and ribs.
    • The derived biarticular costovertebral joints are crucial for managing locomotor forces and reaction forces.
    • Further research comparing snakes with other limbless lizards is needed to fully understand their locomotor versatility.