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Understanding Muscle Movements: How Muscles Work and Create Motion

Muscles are essential for all physical activities as they convert energy into movement. The fundamental action of muscles is contraction, facilitated by bundles of cells called muscle fibers. These fibers contain myofibrils, which are responsible for their contraction through specific muscle proteins triggered by electrical impulses. There are two main types of muscle fibers: fast-twitch, which generate higher forces and contract rapidly, and slow-twitch, which produce force slowly and sustain contractions longer. This guide explores muscle functions, types, and movement actions like flexion, extension, abduction, adduction, and rotation.

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Understanding Muscle Movements: How Muscles Work and Create Motion

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Presentation Transcript

  1. MUSCLE MOVEMENTS

  2. How do muscles work and create movement? • Muscles turn energy into motion • Everything you do is expressed as muscular motion • The basic action of any muscle is contraction • A muscle is a bundle of cells called fibers • A muscle fiber contains myofibrils, which are cylinders of muscle proteins • The proteins allow a muscle cell to contract • The contractions of all muscles are triggered by electrical impulses

  3. Continued…… • Muscles have a mixture of two basic types of fibers; • Fast twitch muscle fibers – capable of developing greater forces, contract faster, and have greater anaerobic capacity What are some anaerobic activities? • 2. Slow twitch muscle fibers – develop force slowly, maintain contractions longer, and have higher aerobic capacity What are some aerobic activities?

  4. FLEXION

  5. Flexion Bending parts at a joint Examples: • Bending at the knee and elbow, bending head forward on the chest

  6. EXTENSION

  7. Extension Straightening parts at a joint Examples: Straightening the leg, elbow, neck

  8. ABDUCTION

  9. Abduction Moving a limb away from the midline of the body. Example: Lifting the arm/leg horizontally away from the body

  10. ADDUCTION

  11. Adduction Moving a limb toward the midline of the body. Example: Returning the arm/leg from the horizontal position to the side of the body.

  12. Rotation

  13. Rotation Moving a part around an axis. Example: Twisting the head from side to side and twisting the trunk from side to side

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