Muscle cell: Difference between revisions
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Muscle cells are also known as myocytes or muscle fibres<ref>Albert D, et al (2012). Dorland's illustrated medical dictionary. (32nd ed.). Philadelphia, PA: Saunders/Elsevier. p. 321.</ref>. These cells develop from myoblasts and are found in [[Muscle|muscle tissue]]. | |||
The microstructure of thses cells is unusual and new terminology had to be determined to describe their structures: | The microstructure of thses cells is unusual and new terminology had to be determined to describe their structures: | ||
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|- | |- | ||
| sarcoplasm | | sarcoplasm | ||
| cytoplasm | | [[cytoplasm|cytoplasm]] | ||
|- | |- | ||
| [[Sarcoplasmic Reticulum|sarcoplasmic reticulum]] | | [[Sarcoplasmic Reticulum|sarcoplasmic reticulum]] | ||
| smooth endoplasmic reticulum | | [[Smooth_endoplasmic_reticulum|smooth endoplasmic reticulum]] | ||
|- | |- | ||
| sarcosome | | sarcosome | ||
| mitochondrion | | [[Mitochondria|mitochondrion]] | ||
|- | |- | ||
| sarcolema | | sarcolema | ||
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<br> | <br> | ||
The sarcoplasm of muscle cells is mostly composed of [[Myofibril|myofibrils]], which, at the same time, are composed of three types of myofilaments<ref>Saladin, K (2012). Anatomy &amp;amp;amp; Physiology: The Unity of Form and Function (6th ed.). New York: McGraw-Hill. pp. 403–405.</ref>: | The sarcoplasm of muscle cells is mostly composed of [[Myofibril|myofibrils]], which, at the same time, are composed of three types of myofilaments<ref>Saladin, K (2012). Anatomy &amp;amp;amp;amp;amp;amp;amp;amp; Physiology: The Unity of Form and Function (6th ed.). New York: McGraw-Hill. pp. 403–405.</ref>: | ||
*[[Myosin|Myosin]] - a thick, dark filament that makes up the A band. | |||
*[[Actin filaments|Actin filaments]] - a thin, light filament that makes up the I band. | |||
*[[Titin|Titin]] - an elastic filament. | |||
These three types of filament will work together to bring about [[Muscle contraction|muscle contraction]].<br> | |||
This basic structure can be found in skeletal muscle cells, as this is where voluntary contraction takes place. Smooth muscle cells (involuntary contraction) and cardiac muscle cells are structurally different.<ref>Alberts et. al., 2015, Molecular Biology of the Cell Sixth Edition, New York, Garland Science, Pages 917-925</ref> | |||
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=== References === | === References === | ||
<references /><br> | <references /><br> | ||
Latest revision as of 18:45, 30 November 2015
Muscle cells are also known as myocytes or muscle fibres[1]. These cells develop from myoblasts and are found in muscle tissue.
The microstructure of thses cells is unusual and new terminology had to be determined to describe their structures:
| Feature | Equivalent in normal cells |
|---|---|
| sarcoplasm | cytoplasm |
| sarcoplasmic reticulum | smooth endoplasmic reticulum |
| sarcosome | mitochondrion |
| sarcolema | cell membrane |
The sarcoplasm of muscle cells is mostly composed of myofibrils, which, at the same time, are composed of three types of myofilaments[2]:
- Myosin - a thick, dark filament that makes up the A band.
- Actin filaments - a thin, light filament that makes up the I band.
- Titin - an elastic filament.
These three types of filament will work together to bring about muscle contraction.
This basic structure can be found in skeletal muscle cells, as this is where voluntary contraction takes place. Smooth muscle cells (involuntary contraction) and cardiac muscle cells are structurally different.[3]
References
- ↑ Albert D, et al (2012). Dorland's illustrated medical dictionary. (32nd ed.). Philadelphia, PA: Saunders/Elsevier. p. 321.
- ↑ Saladin, K (2012). Anatomy &amp;amp;amp;amp;amp;amp;amp; Physiology: The Unity of Form and Function (6th ed.). New York: McGraw-Hill. pp. 403–405.
- ↑ Alberts et. al., 2015, Molecular Biology of the Cell Sixth Edition, New York, Garland Science, Pages 917-925