What is Nervous tissue missing that stops it from going through motosis?

Question

What is nervous tissue missing that stops the tissue from going through mitosis and why is it that this missing peice stopd mitosis?

Thanks

Answer 1

mitosis doesn't simply continually go on in cells; mitosis only occurs when cells get the correct chemical signal to undergo mitosis.

The cell cycle have thigns called checkpoints, where the cell will stop the cell cycle and stop dividing until the cell recieves that go-ahead signal. In the case of the neurons, they never receive or make that signal to go past the G1 checkpoint, which is the "restriction point" (the checkpoint which determines whether a cell will even undergo the mitotic cycle or not), and so they are stuck in a nondividing phase called a G0 phase.

don't get caught up in the checkpoint stuff. just know that in order for a cell to divide, it has to have the proper chemical signal. Neurons don't get this chemical signal, and so they never divide.

Answer 2

I'm not entirely sure, but I think it is a protein called MPF that isn't there. This protein acts as a trigger for the cell to go past g2 phase and into mitosis. It is one of several proteins that act as a regulator of the cell cycle.

Sorry I can't explain better, but hopefully this'll put you in the right direction.

Actually, kz seems to have it, that's probably the best answer for you.

Answer 3

ENDOPLASMIC RETICULUM...............

THE NUCLESUS IS ALSO VER DIMMISIVE