Why do some cells grow back very slowly?

[sameeralord]

Nerve and muscle tissue don't grow back much but epithelial cells in the skin grow very quickly. Why is that some tissues find it difficult to grow back and are replaced by fibrous scar tissue. Can't they do some mitosis and regrow? Thank you

 

[mgb_phys]

Evolution.

Blob A could grow back skin cells quickly after a minor scratch, lived to reproduce and spread the ability to all the little baby blobs.

Blob B had the ability to regrow spinal column cells, unfortunately the nerve damage was due to being bitten in half by big nasty blob C so the ability was no advantage.

 

[sameeralord]

Evolution.

Blob A could grow back skin cells quickly after a minor scratch, lived to reproduce and spread the ability to all the little baby blobs.

Blob B had the ability to regrow spinal column cells, unfortunately the nerve damage was due to being bitten in half by big nasty blob C so the ability was no advantage.

Interesting but I have another opinion as well. May be because these cells are so specialized you can't directly reproduce them. Like a person with a lot of experience you can't just clone him but get experience from starting from square one. Stem cells can be used to start from square one.

Anyway your idea seems right as well.

 

[AyazM]

Olfactory neurons are continuously replaced throughout human life.

 

[LudusRex]

There are several factors that contribute to the varying rates of cell growth and regeneration in different tissues. One of the main factors is the type of tissue itself. Nerve and muscle tissue are specialized types of tissue that have very specific functions and structures, making them less adaptable to cell division and regeneration.

Nerve cells, also known as neurons, have long extensions called axons that transmit electrical signals. These axons are very delicate and can be easily damaged, making it difficult for them to regenerate. Additionally, nerve cells are surrounded by a protective layer called the myelin sheath, which can inhibit cell division and regeneration.

Muscle tissue, on the other hand, is made up of long, fibrous cells that are responsible for movement. These cells are highly specialized and have a limited ability to divide and regenerate. Additionally, muscle tissue is often replaced by fibrous scar tissue after injury, as this type of tissue is better suited for providing structural support.

In contrast, epithelial cells in the skin are constantly exposed to environmental factors and are therefore more prone to damage. As a result, they have a higher turnover rate and are able to rapidly divide and regenerate. This is also aided by the fact that skin cells are relatively simple in structure and function, making them more adaptable to cell division and regeneration.

Overall, while all cells have the ability to undergo mitosis and regenerate, the rate and success of this process is highly dependent on the type of tissue and its specialized functions and structures.