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Every cell in the human body is replaced and renewed within a period of seven years, consecutively, for life. This is known as aging; it includes the brain. Not one cell a person is born with is still there when they reach seven, and again at fourteen, then again at twenty-one, etc. The cells are replaced, respectively, and you are a "brand new" person, however, with the same DNA structure and personality you were born with.
Memory cells can be "recycled" as some information is lost over time.
Sleep repairs and reorganizes the brain; as for new brain cell development, research shows that as one educates their mind new cells form as often as the mind is actively engaged.
EDIT - MijinLaw: The 7-year cycle is a myth. And although neurons can be generated in some circumstances, it's still unclear whether neurogenesis plays any significant role in normal learning.
Plus! Heart muscle cells aren't replaced, that's why heart attacks can be fatal, as the muscle cells which are destroyed are not replaced and may not be enough to keep the heart going. There arnt!!!!!!!!!!!!!!!
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Can brain cells be replaced if damaged?
Yes.
What cells in the human body are replaced frequently compared to brain and nerve cells?
Skin cells
Are muscle cells bigger than brain cells?
It depends on how often you use your brain or muscle
How often are cells replaced in your body?
Every 25 seconds
What type of cells does brain contain?
Brain cells! :D
Which cells in your body are never replaced?
brain cells
Can brain cells be replaced if damaged?
Yes.
Do brain cells grow?
yes but they cannot be replaced
How often do brain cells regrow?
Brain cells are the only, if not one of the few, cells that are supposed to stay in your body for your entire life so they do not get replaced. Actually, research over the last few years has shown that the human brain can grow new brain cells. Particularly the ones used in cognitive memory and learning capability.
What cells in the human body are replaced frequently compared to brain and nerve cells?
Skin cells
Are all the cells in your bodies continually replaced as you age?
Yes except for brain cells that after age 35 are not replaced when they die
What are the effects of glue sniffing?
It kills brain cells and they are not replaced.
How are dead and worn cells in the body replaced?
It all depends on which cells. Some are not replaced. These are mostly nerve cells such as found in the brain. Other cells constantly die and are shed and replaced from tissues below them. An example of this are your skin cells.
Are muscle cells bigger than brain cells?
It depends on how often you use your brain or muscle
How often is cerebral spinal fluid replaced in brain?
It is replaced four times a day.
What are the tharmful effects of glue sniffing?
It kills brain cells and they are not replaced.
How often are your skin cells replaced?
Everyday, baby!
