Types Of Muscle Tissue: Striated, Non-Striated, Voluntary And Involuntary

Types Of Muscle Tissue: Striated, Non-Striated, Voluntary And Involuntary

Question 1. Types of muscles.
Answer:

1. Depending upon the presence or absence of striations.

1. Straited muscle.
   • These muscle contains cross striations.
   • Example: skeletal muscle, cardiac muscle.
2. Nonstraited muscle.
   • They do not contains cross striation.

2. Depending upon action.

1. Voluntary muscle.
   • The activities of it can be controlled at will.
   • Example: Skeletal muscle.
2. Involuntary muscle.
   • The activites of it cannot be controlled at will.
   • Example: Cardiac smooth muscle.

3. Depending upon the location.

1. Skeletal muscle.
   • Found in association with bone.
2. Cardiac muscle.
   • Form musculature of heart.
3. Smooth muscle.
   • Present in hallow viscera.

Question 2. Sarcomere.
Answer:

• It is the structural and functional unit of the skeletal muscle.
• The cross striations which are characteristic feature of skeletal muscle are due to alternate dark and light cross band.
  1. The dark line is highly refractive and is called ‘A’ band.
     • In the middle of `A’ band there is a light area called ‘H’ zone.
     • In the middle of ‘H’ zone lies the middle part of myosin filament called ‘M’ line.
  2. The light band is low refractive and is called ‘I’ band.
     • In the centre of each I band is found a narrow line of highly refractive material called ‘Z’ line.
  3. The substance included between two adjacent ‘Z’ line is called “Sarcomere”.