Muscle Tissue

Definition: Spindle shaped fibre like cells having ability to contract in order to produce movement of body parts is called muscle tissue.

Structure:

1. Shape: The muscle cells are always elongated, slender and spindle shaped fibre like cells. 
2. Covering: There is a outer- tissue above the muscle fibres. -covering of connective 
3. Blood vessels: Blood vessels present in muscle tissue.
4. Matrix: There is no matrix in the intracellular. space between the muscle cells.
5. Nerves: Muscle tissues are associated with nerves.

Function :

1. Movement: Control the movement of organs and body parts, and helps in locomotion.
2. Blood circulation: By contraction relaxation of heart, blood circulate throughout the body. 
3. Producing Heat: Muscle tissues can produce heast in the body.
4. Control in Respiration: Control respiration by the respiratory muscle.

Types of Muscle Tissue:

3 types of muscle tissue are there :

1. Muscle Tissue
2. Smooth Muscle
3. Cardiac Muscle

(I) Striated or Skeletal or Voluntary Muscle :

Definition: Long cylindrical, multinucleate cells generally attached with skeleton and voluntary in action is called straited or skeletal muscle.

Location: Skeletal muscles are attached to bones and occasionally to skin.

Structure :

1. Shape: Long, cylindrical shaped muscle fibre. 
2. Nuclei: This tissue is multinucleated.
3. Striations There is band or striations muscle fibre on the

Function:

1. Shape: It gives the shape of the body. 
2. Movement: As it is voluntary in action, it helps in movement of body parts according to wish.
3. Contraction: It contracts movement very fast helps m

(II) Non-Striated or Involuntary or Smooth Muscle :

Definition: Those muscles controlled by Automatic Nervous System having smooth Involuntary muscle, no bands, they are called non-striated or involuntary muscle.

Location: Blood vessels, Oesophagus, epiglottis, reproductive tracts etc. 

Characters :

1. Shape: short, spindle shaped with pointed end 
2. Nuclei: single nucleus present at centre.
3. Blood supply: This muscle tissue are with less vascular 

Functions:

1. Control: It controls the contraction of internal. organs.
2. Movement: It helps in movement of internal organ.

(III) Cardiac Muscle :

Definition: Branched, striated, generally uninucleate cells and involuntary muscle action is called cardiac muscle.

Location: The walls of the heart.

Characters:

1. Shape: Short, cylindrical with flat ends.
2. Striations: There is band or striation on this tissue. 
3. Action: It is involuntary in action.

Function:

1. Blood circulation: As it contracts the heart, it propels blood into the circulation.