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  • Animals exhibits various movements.
  • The voluntary movement causes the animals to change their place is called locomotion.
  • The cells of human body exhibit amoeboid, ciliary and muscular movements.
  • Skeletal muscles are attached to skeletal elements and they are voluntary in nature.
  • Cardiac muscles are striated, branched and involuntary.
  • Muscle fibre is the anatomical unit of muscle. Each fibre has many myofibrils.
  • Each myofibril contains many serially arranged units called sarcomere.
  • Actin and myosin are polymerized proteins.
  • A motor neuron carries signal to the muscle fibre that generates action potential in it.
  • Based on the presence of pigment in myofibril, muscles are classified into white and red fibres.
  • Bones and cartilage constitute our skeletal system.
  • Skull, vertebral column, ribs and sternum constitute the axial skeleton.
  • Limb bones and girdles form the appendicular skeleton.
  • Synovial joints play a significant role in locomotion.

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