Why do some organs lack the ability to heal?

[opuntia]

I'll try the same procedure
Something tells me that this is going out of topic!

[Dr.Stein]

AWAWAWWAWAWAA please forgive Dr. Chitchat Stein

So, back on topic, ... err ... oh I have no idea what I must say...

Next please...

[opuntia]

Don't worry i'm sure that we all like your chitchatter

[victor]

Can some of you explain about ordinary cell, far-developed cell and full-developed cell?? They aren't written in m textbook..oh yes, talking about nerve, I ever read 'actually nucleus word in the nerve cell is onl for symbolizing something inside the nissl body' is that true?

[Dr.Stein]

You know that the origin of all body cells are mesenchyme (stem cells). This will differentiate to become another cell types. The simple cell type for instance epithelial cells; this type is highly proliferative. More complicated one for example chondrocytes. They also proliferative and can differentiate to become osteocytes. Here you see, osteocytes are far-developed, their proliferation capacity is decreasing. Full-developed cell for instance RBCs and neurons as I told you before.

There is a nice article about stem cells in National Geographic July. Have you get it?

About nucleus vs. Nissl Body... As a cell, neuron has its real nucleus to coordinate its function, that's vital. Nissl Body or Nissl substance, are really just large clumps of rough ER that are clearly visible with a light microscope. Their presence indicates that neurons are major league protein factories. This is common for cells which are secretory cells.