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Class 9, Science, Chapter-6, Lecture-5, Muscle Fibres (Notes)

Differences Between:

Striated Muscle Fibres

Smooth Muscle Fibres

Cardiac Muscle Fibres

1. They are long cylindrical cells.

1. The fibres are elongated, and spindle shaped.

1. The cells are small and cylindrical.

2. The fibres have blunt ends.

2. The fibres have pointed ends.

2. The fibres have broad ends.

3. They possess striations or alternate light and dark bands.

3. Striations or light and dark bands are absent.

3. Striations are present but they are fainter than those of striated muscle fibres.

4. Intercalated discs and cross-connections are absent.

4. Intercalated discs and cross-connections are absent.

4. Intercalated discs and cross-connections are present.

5. The muscle fibre is multi-nucleate.

5. Smooth muscle fibre is uni-nucleate.

5. The cells are uni-nucleate.

6. Nuclei are oval in outline. They occur peripherally below the sarcolemma

6. Nucleus is centrally placed, oval or elongated.

6. Nucleus in oval-rounded. It is centrally placed.

7. They occur in bundles.

7. They generally form sheets.

7. They form a network.

8. Striated muscle fibres occur in limbs, hands, feet, body wall, tongue, pharynx and upper part of oesophagus.

8. The fibres occur in dermis, urinogenital tracts, digestive tract, lungs, iris, blood vessels, etc.

8. The muscle fibres occur only in the wall of heart.

9. They are voluntary.

9. They are involuntary.

9. They are involuntary.

10. They are able to perform fast and powerful contractions.

10. They perform slow but prolonged contractions.

10. Cardiac muscle fibres perform powerful and rhythmic contractions.

11. They soon get fatigued.

11. Fatigue is rare.

11. They seldom get fatigued.