Class 9th – MUSCULAR TISSUE

• Muscular tissue consists of elongated cells which are called MUSCLE FIBRES.
• Muscles contain special Protein called contractile proteins.
• The contractile proteins are Actin and Myosin.
• The role of contractile protein is contraction and relaxation and thus helps in Movement.

STRIATED MUSCLES

• They are voluntary in nature. I.e. they move according to our will. So also known as Voluntary Muscles.
• They are attached to bones so they are called as Skeletal Muscles.
• When viewed under Microscope, the Muscles shows Alternate light and dark bands and thus known as Striated Muscles.

• STRUCTURE:
  • Cells are long and cylindrical.
  • Unbranched.
  • Multinucleated.

• Found in:
  • INNER LIMBS
  • HANDS
  • EYELIDS

SMOOTH MUSCLES

• They are involuntary in nature i.e. they do not work according to our will. So also known as involuntary muscles.
• They do not have striations so they are called as Unstriated Muscles.

• STRUCTURE:
  • Cells are long with pointed ends.
  • Having single nucleus*

• FOUND IN:
  • Iris of the eye
  • Bronchi (present in lungs)
  • Alimentary canal
  • Uterus.

CARDIAC MUSCLE

• Involuntary in nature
• They have striations present on the muscles so called as striated muscles.
• Presence of Intercalated disc*
• Present in the heart.

• Structure:
  • Long
  • Branched
  • Nucleated
  • Have intercalated disc.