Why do brain cells die and fat cells live forever?
348975
fat ones have more blood i guess i don't really know
63303
(scroll to ">>>>>>")\nFor every cell, there is a time to live and a time to die. \nThere are two ways in which cells die: \nThey are killed by injurious agents. \nThey are induced to commit suicide.\nDeath by injury\nCells that are damaged by injury, such as by \nmechanical damage \nexposure to toxic chemicals\nundergo a characteristic series of changes: \nThey (and their organelles like mitochondria) swell (because the ability of the plasma membrane to control the passage of ions and water is disrupted). \nThe cell contents leak out, leading to \ninflammation of surrounding tissues.\nDeath by suicide\nCells that are induced to commit suicide: \nshrink; \ndevelop bubble-like blebs on their surface; \nhave the chromatin (DNA and protein) in their nucleus degraded; \nhave their mitochondria break down with the release of cytochrome c; \nbreak into small, membrane-wrapped, fragments. \nThe phospholipid phosphatidylserine, which is normally hidden within the plasma membrane, is exposed on the surface. \nThis is bound by receptors on phagocytic cells like macrophages and dendritic cells which then engulf the cell fragments. \nThe phagocytic cells secrete cytokines that inhibit inflammation (e.g., IL-10 and TGF-β)\nThe pattern of events in death by suicide is so orderly that the process is often called programmed cell death or PCD. The cellular machinery of programmed cell death turns out to be as intrinsic to the cell as, say, mitosis. \n\nProgrammed cell death is also called apoptosis.\n\n1. Programmed cell death is as needed for proper development as mitosis is. \nExamples: \nThe resorption of the tadpole tail at the time of its metamorphosis into a frog occurs by apoptosis. \n>>>>>>>>The formation of the fingers and toes of the fetus requires the removal, by apoptosis, of the tissue between them. \nThe sloughing off of the inner lining of the uterus (the endometrium) at the start of menstruation occurs by apoptosis. \nThe formation of the proper connections (synapses) between neurons in the brain requires that surplus cells be eliminated by apoptosis
1065198
because your metabolism slows down, but you eat the same.\nThose are the areas that are prone to fat storage.
1114355
Your brain needs some fat in order to function.
860647
Prokaryotic cells do not have the same lifespans as eukaryotic cells. This is because they do not carry out the same metabolic functions as eukaryotic cells.
785474
Yes actually it is possible. Certain cells in the body only regenerate a specific # of times. Those cells tend to be what determines "natural death". Cells are capable of regenerating infinite numbers of times, and some do (like epithelial cells). If all of the cells of the body could be reprogrammed so that they didn't "count" when they regenerate, then yes it is possible to live forever. This is a question several institutions are beginning to work on, and several others have been working on since the 1970s.
807565
brain damage from killing so many brain cells.\nlosing control of your body parts, like arms and legs.\ndeath.
712314
Humans were not supposed to die.\n\nAll forms of vegetable life, as well as animal life, are transitory. A long-standing question among scientists has been, Why does man grow old and die?\n\nSome scientists propose that there is a genetically determined life span for each cell. For support they point to experiments in which cells cultured in an artificial environment were found to stop dividing after about 50 divisions. Other scientists, however, contend that such experiments do not provide insight into why whole organisms age. Various other explanations are offered, including the theory that the brain releases hormones that play a large part in aging and subsequent death. That a person must be cautious about accepting one theory over another is suggested by the comments of Roy L. Walford, M.D., who said: “It’s not a cause for alarm or even surprise that Hayflick’s paradigm [the theory that aging is built into the cell’s genetics] may prove ultimately false, or be replaced by a better but ultimately equally false paradigm. Everything is true for its own time.”—Maximum Life Span, 1983, p. 75.\n\nIn considering the findings and conclusions of scientists, it should be noted that most do not credit life to a Creator. Through their own efforts, they hope to discover the secret of aging and death so as to extend human life indefinitely. They overlook the fact that the Creator himself decreed the death sentence for the first human pair, implementing that sentence in a way that man does not fully understand; similarly, he holds forth the prize of everlasting life to those who exercise faith in his Son.—Ge 2:16, 17; 3:16-19; Joh 3:16.
674301
Yeah, It is called oxidation. The cells die and the nuclei become dark, because of the toxic levels in oxygen. Funny how it keeps us alive.
894801
Cells are dying and multiplying constantly, your question is like asking how many gallons of water are in the Atlantic Ocean..☺
583927
A person can live without food for quite some time, usually for many weeks. \nThe body will use its fat and protein stores (muscles) to help it survive. \nIf a person has a lot of fat stores (is very heavy), they will live longer than a \nperson who has very little fat (very thin), so how long a person can survive \ndepends a lot of the person. Of course, if you go without food for a few weeks, \nyou will be very weak since you have been using your own muscles for energy. \n\nWater is a different story. A person will die within 3-4 days without water. The \nsize of the person really doesn't make much difference.
973307
Because cells must keep an optimal surface area:volume ratio in order to be able to receive food and transport it throughout the cell effeciently. If they grew too large, they would starve and die.
488147
You had better believe it....If we treat our machines like we treat our bodies, we would be considered as being reckless. Improving brain cells can be accomplished by (basically) the following points.\n\nSTAYING MENTALLY ACTIVE: Mentally stimulating activities strengthen brain cells and the connections between them, and may even create new nerve cells.\n \n REMAINING SOCIALLY ACTIVE: Social activity not only makes physical and mental activity more enjoyable, it can reduce stress levels, which helps maintain healthy connections among brain cells.\n \nSTAY PHYSICALLY ACTIVE:Physical exercise is essential for maintaining good blood flow to the brain as well as to encourage new brain cells. It also can significantly reduce the risk of heart attack, stroke and diabetes, and thereby protect against those risk factors for Alzheimer's and other dementias. \n \nADOPTING A BRAIN-HEALTHY DIET:Research suggests that high cholesterol may contribute to stroke and brain cell damage. A low fat, low cholesterol diet is advisable. And there is growing evidence that a diet rich in dark vegetables and fruits, which contain antioxidants, may help protect brain cells.
49056
from what I learned in my anatomy class, when you gain fat cells you never lose them. They shrink when you lose weight. Thats why overweight people have to stick with a healthy lifestyle after they lose a bunch of weight because its so easy to enlarge those fat cells again if they go back to bad eating habits.
355307
It isn't a very good control if your cells die before the experiment is complete.  More info is needed to get a more specific answer.
1022770
The reason plasm exisits in all living things is because all living things are made up of cells, which have organelles (eukaryotic cells) and these organelles are suspended in an plasma such as cytoplasm. Without plasma these organelles would not be able to survive and function and therefore the cell would die and therefore the organism (animal) would die.
921540
It's different for each tissue in the body... some examples are: epithelial (skin) cells: 1 month, or neurons (brain cells) : 50 years.