MUSCLE TISSUE

• Muscle Tissue


  It is characterized by the ability to contract or move upon stimulation. (body movement) and is composed of cells that optimize the universal cell property of contractility
• Mesodermal


  Muscle cells originate here and differentiate by a gradual process of cell lengthening with abundant synthesis of the myofibrillar proteins (contractile proteins)
• 2 Myofibrillar proteins in the muscle tissue:

  • Actin
  • Myosin
• Sarcoplasm


  The cytoplasm of muscle tissue
• Sarcoplasmic Reticulum


  The smooth endoplasmic reticulum of muscle tissue
• Sarcolemma


  The cell membrane and external lamina of muscle tissue
• 3 Types of Muscle Tissue:

  • Skeletal Muscle
  • Cardiac Muscle
  • Smooth Muscle
• Skeletal Muscle


  A multi-nucleated cells with cross striations. It is quick, forceful, and usually voluntary contractions
• Cardiac Muscle


  A branched cells bound to one another at structures called intercalated discs. It also contain cross striations and the contraction is involuntary, vigorous, and rhythmic.
• Smooth Muscle


  It have fusiform cells which lack striations and contraction is low and involuntary
• Striated or Voluntary Muscle


  It is also known as Skeletal Muscle
• Skeletal Muscle


  It responsible for the movement of the skeleton as well as organs such as the globe of the eye and the tongue
• 10-100 μm


  The diameter of skeletal muscle
• Satellite Cells


  This cell proliferate and produce new muscle fibers following muscle injury
• Connective Tissue


  This layers of tissue is present in all types of muscle and is seen well in skeletal muscle
• 4 organizations of Skeletal Muscle:

  • Epimysium
  • Perimysium
  • Endomysium
  • Deep Fascia
• Epimysium


  An external sheath of dense irregular connective tissue that surrounds the entire muscle
• Perimysium


  A thin connective tissue layer that immediately surrounds each bundle of muscle fibers termed a fascicle
• Endomysium


  Thin delicate layer of reticular fibers tissue surrounding the external lamina of individual muscle fibers.
• Fascicle


  A bundle of muscle fibers
• Deep Fascia


  Dense irregular connective tissue overlying epimysium
• Myotendinous Junctions


  It joins the muscle to bone, skin, or another muscle
• Collagen


  It is preset in the layers of connective tissue which transmits mechanical forces generated by each muscle cells or muscle fiber
• Sarcoplasm


  It is highly organized, containing primarily long cylindrical filament bundles
• Myofibrils


  A long cylindrical filament bundles in the sarcoplasm
• Dark band


  It is seen in the alternating striations of the A band
• Light band


  It is seen in the alternating striations of the I band
• A band


  The darker bands of skeletal muscle cell
• I band


  The lighter bands of skeletal muscle cell
• Z disc


  A dark transverse line which bisects the I band
• Sarcomere


  The repetitive functional subunit of the contractile apparatus
• The sarcomere is repetitive functional subunit of the contractile apparatus that extends from Z disc to Z disc
• 1 


  How many sarcomere is equivalent between the Z Disc to Z Disc?
• The A and I banding pattern in sarcomeres is due mainly to the regular arrangement of thick and thin myofilaments, composed of myosin and F-actin
• True


  TRUE OR FALSE:

  The I band consists of the portions of the thin filaments that do not overlap the thick filaments in the A bands
• A band contain both the thick filaments and the overlapping portions of thin filaments
• H zone


  It have the presence of a LIGHTER ZONE in its center, corresponding to a region with only the rodlike portions of the myosin molecule and no thin filaments
• Thin Myofilament


  A filament that is composed of Actin (F-actin) molecules and two associated regulatory proteins
• Two associated regulatory proteins of thin myofilaments:

  • Tropomyosin
  • Troponin
• Thick Filament


  A filament that is composed of myosin molecules and occupies the A band