Muscular System - Notes, Biology, IAS UPSC Notes | EduRev

General Science(Prelims) by IRS Divey Sethi

CLAT : Muscular System - Notes, Biology, IAS UPSC Notes | EduRev

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Muscular System

Muscular System - Notes, Biology, IAS UPSC Notes | EduRevMuscular System - Notes, Biology, IAS UPSC Notes | EduRev

 

  • Human body has about 639 types of muscles.
  • Muscles specialized to contraction are of 3 types :
    • Striated
    • Unstriated and
    • Cardiac.
Striated Muscles
  • Striated Muscles are 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.

Muscular System - Notes, Biology, IAS UPSC Notes | EduRevStriated Muscles

  • Its cytoplasm is called sarcoplasm in which are present large number of contractile myofibrils.
  • Myofibrils are made up of thick myosin and thin actin filaments.
  • They are present in limbs, tongue, pharynx, etc.
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 fatigued fibers which are found in the wall of heart where they form myocardium.
  • They generate their own wave of excitation.

 

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