How long do Human cells live?
921540
It's different for each tissue in the body... some examples are: epithelial (skin) cells: 1 month, or neurons (brain cells) : 50 years.
258248
One year and 10 months old.  \n\nYou take 1 million minutes, divide by 60 to get how many hours they have lived, divide by 24 to get how many days they have lived, divide by 365 to get how many years they have lived.  You arrive at 1.9 years, which is the same as 1 year 10 months.
681793
The common rumor is every 7 years every cell in your body replenishes itself.  The real truth is your body is constantly rebuilding itself.  Your skin rebuilds very quickly look how fast cuts heal.
540881
One single drop of blood contains around a million erythrocytes, or Red Blood Cells \n and FYI, the average life span of a Red blood cell is 120 days!!!
921897
Sperm life is dependant  on many variables.Generally sperm lives about three days,but it the sperm are in good\nquality cervical fluid they can live up to 5 days.Sperm that \nreach the optimal enviroment beyond  the female cervix\nmay live for 5 days.Sperm that stays only in the vaginalive only a few hours and even less if exposed to air\noutside the body.Sperm that carry  genetic info for female offspring swim  slower and live longer than the male  designated  sperm.
592168
Because of advances in Medicine. That is the whole reason why people live longer and more babies live past being an infant. If it were not for medicine, the human race would still have an average life span on 25-35 years.
1089146
I'll stay strictly biochemical, and not consider teliology or evolution, since the previous answerer addressed some of this.\nThough there is a hypothesis that aging and death occur because of damage, oxidative stress, etc, there is actually very little data to support this-in fact, the information we have explicitly argue against this.  Rats, mice, etc, live only 2-3 years, and show cellular degeneration, etc, very similar to that seen in aged humans, and yet are not exposed to greater levels of oxidative stress, or indeed extra stress of any kind, than humans.  If it truly were a matter of stress exclusively, the range of survival times would tend to be much broader than what we see- IN other words, some humans would die of old age at 5 or 6 years old, and some would live to 200-300 years old.  Stress, oxidation, poor diet can indeed influence the age at which we die, but they are not the primary determinants... it is apparent that this is a genetically controlled phenomenon, and that it occured soon after the rise of multi-cellular organisms, and that it varies greatly between species.  There have been some senescence genes found, that are specifically turned on that seem to guide cellular damage-however, it seems as if the greatest portion of the aging process, developmentally, is caused not be production of completely new proteins which end up killing us, but by variations of levels of proteins already expressed- For instance, there are significant decreases throughout life in a number of hormones, including androgens (in men) growth hormone, insulin-like growth factors, various neurotrophic factors, etc- and a concomittant rise in others, especially pro-inflammatory hormones, such as TNFa and certain interleukins.  All of this is genetically and developmentally regulated to a fairly specific time, and is slightly variable depending upon diet, exercise, etc- It is similar to the timing of puberty, which is primarily set as 11-16 years old, but is variable depending on environmental factors.  Outside of specific diseases, puberty will occur between approximately 8 and 18-19 in over 95% of the population, and in 100%  of the population (again, assuming no genetic defect or disease) will have occured by 21 or so.  human death, under the best of circumstances, probably will occur at around 85-90 years.  outside of specific non age related diseases, the range will be around 65-115, which is pretty tight.  The fact that we have *never* observed a mammal that lives forever, the genes that control senescence are likely very tightly connected to genetic programs necessary for survival-so that if an animal is missing the genetic program that controls death, it won't survive embryogenesis to begin with (otherwise, some percentage of mammals would live extremely long-which likely is extraordinarily damaging to the population of that species, and is thus dramatically regulated so it will never occur).\nIt is fairly likely that, within the next 100 years, this genetic control program will be dissected and understood, and then it will be a short time until it will regulatable clinically.  \nDeath is controlled by our genes, which are, in the end, simply biochemical control systems, and which are comprehensible with enough study- Then it becomes a societal decision as to how we should manipulate this.\n*edit* There is interesting observation with telomeres, and about 10 years ago, we thought this might be the hidden secret, but unfortunately, it doesn't appear to be so.  In many immortal, or long-living cells, telomeres play no role, and even in cells in which telomeres are artificially extended, there is still senescence (though it appears to occur somewhat later).  Telomeres are a clock that determines how many times a cell may divide before it enters a "cellular suicide" program, and thus it was thought this was critical to lengthening lifespan-however, most sensescence in mammals does not seem to occur because o
180604
No, the human body is a very large collection of atoms, the cells are made up of all sorts of things taht each could be divided into smaller things and that on the other hand maybe can bedivided into smaller things until you find that all that is left is atoms.
760649
10,000\n\nHalf life means that after 5,000 years, half the radiation is present. In another five thousand years years, only a quarter is left. In another 5,000 only an eighth is left, etc.
1136349
Male Musca domestica (house fly) kept in the lab at room temp and otherwise benign conditions lived 53.5 +- 1.4 days on average. For comparison, Drosophila melanogaster (common fruit fly) males lived 65.5 +- 1.8 days.\n\nOf course, in the wild, they will live shorter lives. Fruit flies are mostly dead after three weeks as an adult, and house flies should survive a little bit longer, perhaps a month.
921174
http://en.wikipedia.org/wiki/Cell_%28biology%29\n\ndoes this help any?
616368
We live as long as we want to.  Believe it or not people generally know how long they are going to live.  Taking into consideration things like heredity and lifestyle, we can rate our own lifespan just like we rate many other things.
180981
whats your life expectancy ?
85798
Life expectancy at birth:\ntotal: 78.65 years (2005 est.)\nmale: 75.66 years\nfemale: 81.81 years
66851
The longest cells in the human body are the motor neurons. They can be up to 4.5 feet (1.37 meters) long and run from the lower spinal cord to the big toe. The longest living cells in the body are brain cells which can live an entire lifetime.
377877
Yes, follicle cells like all cells have a life cycle. They only live for a period of time, if they don't then you'd have cancer. Once the follicle cell dies the hair falls off preventing it from growing longer.\n\nbtw, can't u answer with "God is amazing like that" for every question? Please.... I guess God is great so you don't have to think.
545487
The sun has lived for a long time actually the sun isn't alive but anyway stars usually live for a bout ten billion years.  they know this by looking at the history of other stars and how much they have gone out in the short amount of time  it was being studied. The sun is burning its hydrogen gas so its not a really accurate guess but its pretty close. but you wont have to worry about the sun burning out because you will already be dead for a long time.