A state in which an organism or a cellular system, as defined by its full set of functionality, ceases to exist (i.e., most of the functions are irreversibly lost).

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Can tardigrades survive being eaten?

Compared to a tardigrade, the cockroach seems fragile. But can tardigrades survive the acidic environment of being eaten by most animals?
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3answers
7k views

Can the dead be brought back to life by viruses?

Zombies have been a part of popular culture for decades. The living dead rising up to take over the world is a terrifying concept, worthy of Hollywood blockbusters and television hits. Some of those ...
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2answers
2k views

Why do humans bury their dead? [closed]

As far as we know Ape Men or the Neanderthal Man was the first to bury its dead. My question is why. I don't think they practiced religion or believed in spirits or faith or stuff like that. ...
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1answer
121 views

Is a stab wound to the back lethal? [closed]

How deadly is a stab in the back? Video games, movies, and other fiction would have us believe that a backstab against a foe with a modestly-sized blade leads to immediate and certain death, having a ...
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1answer
51 views

Does the second law of thermodynamics cause aging? [closed]

What is the current understanding as to why organisms age and die? In the following explanation on Ask an Engineer, entropy is not even considered (despite it being answered by an engineer). Unless ...
22
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3answers
4k views

Do all organisms have to die?

I understand (a little) that there are biological clocks and reason that after a certain amount of time organisms die. I'm wondering if that is something inherent in our DNA or in biology/chemistry in ...
3
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1answer
75 views

What happens to blood after a person dies?

After a human dies, what happens to their blood? I know that it tends to accumulate in the lower areas of the body, whichever parts are closest to the ground, but I am wondering about coagulation. ...
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3answers
97 views

Does DNA influence death (e.g. by cell aging)

I know that we age because of errors in the cell replication process and these errors eventually leads to death. If we exclude environmental factors, are there any other factors that can cause these ...
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4answers
13k views

How long can a naked human survive on Mars?

How long can a naked human survive at the surface of the Mars planet? For instance, let's say a worker's base takes fire while he sleeps, and he has to run to the emergency building 200 meters away ...
4
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1answer
119 views

Blood after death

After the heart stops beating, do the red and white blood cells and the other cellular elements in the blood become non-functional immediately? Or does it take time? Would clotting occur after death? ...
2
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1answer
70 views

Most painless method for killing insects

I'm planning on having a small farm of crickets or grasshoppers. I would like to cause them as little suffering as possible, so I'm wondering what is the most painless way to kill them? So far, the ...
2
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1answer
79 views
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43 views

How did the tendency to perform death rituals evolve?

Both elephants and humans perform rituals when deaths occur. However, I do not see any evolutionary benefit of this. The rituals take time, which apparently could be better spent hunting, foraging, ...
0
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1answer
85 views

Biologically, does life and death matter? [closed]

(Sorry that I'm on mobile, so I can't make a good formated question (no links). I will add them later. Just can't resist the urge to ask) In the recent hot question about whether mitochondrial is ...
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4answers
10k views

Can nosebleeds cause death?

Can epistaxis or nosebleeds be a of cause death?
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1answer
40 views

Anopheles arabiensis lifespan and sporogony duration

What is the longest observed lifespan of a mosquito, especially of the species Anopheles arabiensis? How long does it take for Plasmodium parasites to develop and move into the salivary glands of ...
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1answer
99 views

Normal death experience [closed]

Consider a natural cause of death (no car accidents etc) - Is it true that death is generally preceded by suffering? In other words, are we destined to experience the most severe suffering we could ...
5
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2answers
174 views

Why is living muscle tissue seemingly able to restore its shape under force, while dead tissue is not?

When I press my finger, even with relatively little force, into beef or chicken (say, at a grocery store), the indentation remains. When I poke a cow with my finger, the indentation does not remain. ...
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2answers
10k views

Can one die from pain?

Is it possible that a human or any other creature can die from pain? I googled and found different answers. Some articles say Yes while others say No.
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1answer
220 views

Why do only humans commit suicide? [closed]

Why is it that only humans commit suicide? Many animals do 'brave' things to protect their children or family, and some male spiders sacrifice themselves so that they can impregnate the females. ...
5
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1answer
836 views

What produces the strong odor of decaying dead animals?

Are there specific chemicals responsible for producing the strong, putrid odor that is present after an animal deceases? Also, how long does this odor last?
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0answers
35 views

Why does death exist? [duplicate]

The biological purpose of an organism is to reproduce and as soon as reproductive age is passed, aging kicks in and eventually leads to death. (This is what I learned from a gerontologist.) But then, ...
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0answers
47 views

Death Psychology [closed]

Why do we sympathize in general when we see something or someone dying even if we personally don't know it/them? Is there any species which sympathize with the death of its own species? Is there any ...
6
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2answers
12k views

Why is dimethyltryptamine (DMT) being released during death?

I'm not very well informed about all the things related to biology and the current achievements of science in this field so if I'm wrong in anything I say, please let me know. Many times I've come ...
4
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1answer
829 views

How long does it take for a cricket to die at subzero temperatures?

I am on a number of reptile groups and I often hear freezing recommended as a humane way to get rid of surplus feeder insects. However, they can also revive if you don't leave them in there long ...
8
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2answers
665 views

In humans what is the last metabolic process to cease after death?

After death which of our body's metabolic processes will continue functioning for the longest?
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2answers
810 views

What would cause crows to be attracted to a human body?

On another SE site, there was a comment that told me something about biology that I already know: "A man left murdered in the fields would soon have a flock of crows mobbing his fragrant corpse." ...
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1answer
611 views

For how long can a person drink sea water?

How long could a person of lets say 18 years be able to drink sea water without getting too much into trouble ? Or can a person drink it without noticing that it is a very bad idea ? I don't mean in ...
10
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2answers
2k views

How long does it take for memory to disperse after death?

1: There seem to be cases where coma patients with a non-active brain (i.e. flat EEG) have regained full consciousness. => Apparently memory and knowledge are stored independent of brain activity. 2: ...
5
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4answers
65k views

How long human can survive with just drinking water everyday

Can humans live without eating food, just by drinking water? How long can we survive just by drinking water everyday?
5
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2answers
256 views

Do animals suffer from “Human” mental disorders?

It is tragic, but apparently Killer whales and Dolphins can commit suicide too (e.g. here)... This suggests they can become depressed. I wondered whether they were "clinically" depressed like many ...
2
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2answers
138 views

Breakdown current for human body

If I am not mistaken, during exposure to electricity sources it is the magnitude of the current and not the voltage that kills the human body. If so, what is the order of magnitude of current that ...
1
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1answer
160 views

What are the effects of muscle and fat mass on survivability?

If we have humans A, B and C who are different: A is thin (skinny) without significant muscle or fat mass. B is muscular C is fat Which one of them has the best body for survival in accidents like ...
3
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1answer
299 views

molecular indicators of apoptosis: clarification needed

I understand that DNA fragmentation is a molecular indicator of apoptosis. What distinguishes this as a hallmark of programmed cell death, versus one of necrosis?
5
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1answer
607 views

What could account for an apparent loss of mass at death?

An interesting tidbit floating around the internet these days is that Dr. Duncan MacDougall apparently weighed people shortly before and after death, and found an average of a 21 gram discrepancy, to ...
5
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1answer
382 views

In the vacuum of space would death be instantaneous?

I was arguing with my colleague about this matter (I'm not going to mention which side I fall on). Would death be immediate in the vacuum of space? For example, if I was suddenly teleported into the ...
3
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1answer
1k views

How long can a unicellular organism live without nutrition? What happens after that? Does it depend on the domain?

Say I have three unicellular organisms: a eukariote, a bacterium and an archaeon. If I cut off nutrition from them at the same time, how long will it take for them to die? What will their death look ...