SPOTTING CLASS XI ANIMAL TISSUE

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Experiment No.: - 1.1

AIM: -

To observe and make labelled diagram of the microscopic structures of striated muscle tissue.

COMMENTS: -

1.  1. The muscle fibres are elongated, cylindrical and lie parallel to each other.

2.    2.  Each fibre is multinucleated and is covered by a membrane called sarcolemma.

3.    3. Each fibre is filled with sarcoplasm, in which numerous myofibrils are arranged lengthwise.

4.   4. Each myofibril is differentiated into light coloured I-band and dark coloured A-band, which produce cross striations in muscle fibres.

5.  5. Striated muscles are attached to the bones and are present in the general musculature of the body. They are under the control of the will of animal.

 

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Experiment No.: - 1.2

AIM: -

To observe and make labelled diagram of the microscopic structures of non-striated muscle tissue.

COMMENTS: -

1.    1.The muscle fibres are elongated, spindle shaped and are arranged into bundles.

2.    2.Each muscle fibre has an oval shaped nucleus in the thickened middle part and is covered by a thin membrane called sarcolemma.

3.    3.The sarcoplasm (cytoplasm) contains numerous thin myofibrils running lengthwise. Transverse striations are absent.

4.    4.The relaxed fibres appear thin and elongated while the contracted ones appear thick and short.

5.    5.Non-striated muscles occur in the walls of alimentary canal, blood vessels, urinary and genital ducts and are not under the control of will.

 

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Experiment No.: - 1.3

AIM: -

To observe and make labelled diagram of the microscopic structures of cardiac muscle tissue.

COMMENTS: -

1.     1.The muscle fibres are cylindrical branched and anastomosing.

2.     2.Each fibre is covered with sarcolemma and may be uninucleate or binucleate.

3.     3.The muscle fibres have longitudinal striations along with the faint cross striations in the sarcoplasm.

4.     4.The fibres are characterised by the presence of intercalated discs, where two fibres or their branches join.

5.     5.Cardiac muscles are found in heart only.

6.     The cardiac muscles are involuntary and work continuously throughout the life without getting tired.

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