Types of muscle fibres

March 12, 2018

Points of difference	Unstriped muscles		Striped muscles	Cardiac muscles
1. location	In the walls of hollow internal organs, like stomach, intestine, etc		Attached to the skeleton	In the walls of heart.
2. shape	Elongated, spindle- shaped, tapering at both ends.		Long, cylindrical, non tapering, unbranched	Elongated, cylindrical and branched.
3. arrangement	Arranged in tubes.		In bundles	Forming a network
4. sarcolemma	True sarcolemma not found		present	present
5. nucleus	Uninucleate, and central nucleus		Multinucleate, and peripheral nucleus	Many nuclei between successive end plates
6. cytoplasmic contents	Less mitochondria and glycogen granules		Numerous mitochondria and glycogen granules	Numerous and large mitochondria and glycogen granules faintly present
7. striations	absent		present	Faintly present
8. blood supply		poor	rich	rich
9. myofibrils		Smaller and indistinct	Larger and much greater in number	Myofibrils are visible
10. nerve supply		From autonomous nervous system	Have both motor and sensory nerve endings from central nervous system	From autonomous nervous system
11. mode of working		involuntary	voluntary	Myogenic
12. contractions		Slow and rhythmic with long resting period	Rapid with short resting period	Continuous and rhythmically
13. tiredness		Do not get tired easily	Becomes tired easily	Do not get tired
14. energy demand		Much less and constantly	High and at a time	High and constantly