MUSCULAR SYSTEM-BIOLOGY- TNPSC,TET,RRB,SSC SCIENCE (GK) STUDY MATERIAL

MUSCULAR SYSTEM

  • Human body has about 639 types of
    muscles.
  • Muscles specialized to contraction are of 3
    types: striated, unstriated and cardiac
    Striated Muscles/Voluntary / Skeletal
    muscles
  • Also called skeletal muscles.
  • These muscles are mostly attached to bones
    by tendons and takes part in voluntary
    movements under conscious control of
    brain. Therefore they are called voluntary
    muscles.
  • Each muscle fibre shows dark and light
    striations and is covered by a sheath, the
    sarcolemma.
  • Its cytoplasm is called sarcoplasm in which
    are present large number of contractile
    myofibrils.
    Unstriated Muscles
  • These smooth muscles are involuntary
    muscles.
  • Functionally they are of two types –single
    unit and multi unit.
  • Single unit smooth muscles are present in
    urinary bladder and gastro intestinal tract.
  • Multi unit smooth muscles are present in
    walls of large blood vessels.
    CARDIAC MUSCLES
  • They are involuntary, striated and non
    fatiguedfibres which are found in the wall of
    heart where they form

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