Friday, April 2, 2010

Specialised Cells Research - Group 3, The Study of Human Muscle Cells


The Structure of the Human Muscle Cell












Obviously comes from the muscle of the human, and have a unique structure compared to other cells.

There are various types of organelles found in the cell. Each having various types of functions. This gives the cells a unique function for the human body.
Let's talk about the organelles now.
  • Each muscle cell is covered by a plasma membrane sheath which is called the sarcolemma.

  • What is a sarcolemma? The sarcolemma is the cell membrane of a muscle cell. It consists of a true cell membrane, called the plasma membrane.

  • Tunnel-like extensions from the sarcolemma pass through the muscle fibre from one side of it to the other in transverse sections through the diameter of the fibre. These tunnel-like extensions are known as transverse tubules.

  • The nuclei of muscle cells are located at the edges of the diameter of the fibre, adjacent to the sarcolemma. A single muscle cell may have many nuclei.
  • The cytoplasm in the muscle cell is called sarcoplasm.

  • There are many mitochondria present in the muscle cell

  • Sarcoplasmic reticulum is a network of membrane-enclosed tubules similar to smooth endoplasmic reticulum (SER). Sarcoplasmic reticulum is present in muscle fibres/cells and extends throughout the sarcoplasm of the cell. The function of the sarcoplasmic reticulum is to store calcium ions, which are necessary for muscle contraction.


  • As we conclude, the different organelles are important for the cell to carry out life processes for the cell.

    Done by: Group 3
    Images:http://www.frame.org.uk/dynamic_images/human_muscle_cells.jpg
    Sources: http://www.ivy-rose.co.uk/HumanBody/Muscles/Muscle_Cell.php, en.wikipedia.org/wiki/Sarcolemma

    15 comments:

    1. I did not know that the muscle cell has a special type of cell membrane that has its own name, which is the sarcolemma.

      P.S. Sorry Mr Loh. I couldn't comment last night because I had to attend a church service and I got back only around 11++ so I couldn't comment.

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    2. I didnt noe that the cell membrane has a name of it's own

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    3. Although I knew that there are myofibril in the muscle cell, I did not know that there are filament in the myofibril.

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    4. I didn't know a muscle cell has many nuclei.

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    5. I did not know how does the cross section of a muscle cell look like until I saw the picture above.

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    6. I did not know the muscle has many nuclei and that the function sarcoplasmic reticulum is to store calcium ions

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    7. arcoplasmic reticulum is a network of membrane-enclosed tubules similar to smooth endoplasmic reticulum

      I did not know that in the muscle cell, there was another name for the smooth endoplasmic reticulum

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    8. I did not know that the muscle has so many components.

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    9. I did not know that the muscle cell had so many nuclei and that the muscle cell has a special cell membrane that has its own name, sarcolemma.

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    10. I have learnt that ach muscle cell is covered by a plasma membrane sheath which is called the sarcolemma.

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    11. I have learnt that the muscle cells has many nuclei.

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    12. i didi not know that it's own special cell membran

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    13. I did not know that human muscle is made up of speciallised cells which contain many myofibril, which make up the muscle.

      Daniel

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    14. i learnt that a muscle cell contains so many cell parts and the functions of it which i didn't know off before

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    15. I finally know how the actual cell look like (in perspective) and I didnt know there was sarcolemma in it

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