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18

The immortal jellyfish can revert back to its immature polyp stage after reaching maturity, then mature again, over and over. You can read more on the wikipedia page, but this ability means it can potentially avoid senescence altogether.


10

Yes, it can, but it is extremely rare. ... nosebleeds are rarely fatal, accounting for only 4 of the 2.4 million deaths in the U.S. in 1999 [1]. The main issue is that epistaxis can be a sign of potentially fatal diseases: The instances in which nosebleed is potentially fatal are those in which there is a history of recent head injury, severe ...


6

Two compounds are specifically associated with the smell of decaying cadavers (Hoffman et al., 2009), namely: 1,5-pentanediamine (cadaverine), and 1,4-butanediamine (putrescine) Cadaverine is produced by breakdown of lysin and putrescine by the breakdown of ornithine (Science ME). Both are nitrogen-rich compounds and particularly pungent-smelling. ...


6

Any injury, that results in external bleeding can lead to death, since it is a breach in the body's defenses and an entry point for pathogens. Explanation: When you have nose bleeding the blood must be coming from somewhere. Usually from inside your body. That means there is a hole in your body which is big enough for blood to stream out. That in return ...


5

You have a very interesting question there! In order to answer, however, we must examine the most widely excepted "reason" for why we age and eventually die. Most scientists agree that it is because of mass cell death. Normally you and I would be able to deal quite well with mass cell death (such as a very large injury), the problem comes in when we are ...


4

Yes. Usually only in the case of someone with hemophilia (no blood clotting) but it could theoretically occur with any serious uncontrolled nosebleed. Since blood in the stomach tends to cause vomiting, you could also lead to a scenario where someone who was uncomfortable with blood would pass out due to being scared of the blood and then aspirate (puke and ...


3

I think the key is "his fragrant corpse." When an animal dies and begins to rot, a number of quite smelly chemicals are given off, including putrescine and cadaverine. Crows and other carrion birds like vultures are probably very sensitive to these compounds, rather like sharks are to the smell of blood.


3

Alain Bombard He is a french biologist who voluntarily tested how many days a man can survive drinking seawater and how? Biologist point of view Sea contains ~3.5% of salt$^1$. Our kidney separates the waste from water and excrete them in urine provided the salt content is less than ~2%.$^2$ So, it will take the water already present in the body. ...


3

Yes it can but it is very rare. Most often when you get a nosebleed it is either a vein or capillary that ruptures. However in some cases it is arterial bleeding which is always an emergency. I have honestly noticed when I have nosebleeds often each one is worse than the previous with some having a lot of bleeding but still no gushing from an artery. ...


3

The actual paper that the linked article cites never mentioned about freezing the crickets: We examined CCR (Chill Coma Recovery) in G. pennsylvanicus exposed to 0 °C. The time required for crickets to recover movement of the abdomen and legs increased exponentially with the duration of exposure to 0 °C; after more than 12 h of cold exposure, ...


3

One difference between living and dead tissue, but specific to muscles is tonus. In living skeletal muscle, random nerve impulses fire to keep muscles in a partially contracted, ready-to-use state. Without this low-level tension sarcomeres, the basic units of skeletal muscle, would not recover from being poked and could more easily be pulled out of optimal ...


3

Capillary refill time is defined as the time taken for the capillaries to refill after the blood in them has been squeezed out by pressure. It is widely used as a quick way to determine the effectiveness of the circulatory system in humans by doctors. In a normal living organism, the capillaries will take time to refill after they have been emptied. Muscle ...


2

What is the longest observed lifespan of a mosquito, especially of the species Anopheles arabiensis? Mean lifespan calculations for Anopheles arabiensis range from 14 days (Karoki, 2013)* to 21 days (Yamada et al. 2014)** *This Masters thesis tests efficacy of different drugs against An. arabiensis, 14 days is the mean control lifespan. **These An. ...


2

Carrion birds, such as crows and vultures, eat dead animals. As a whole, it's possible that they detect carrion by the smell or visually. Crows specifically are omnivorous and predatory in addition to being carrion scavengers. I suspect that they will try to eat anything that doesn't fight back, especially if they are hungry enough and there is exposed ...


1

Check out the sources of Wikipedia article: the mortality rate is up to 4%. The main causes of "immediate" death in penetrating trauma are shock (low blood pressure due to external/internal hemorrhage, especially arterial hemorrhage), pneumothorax, penetrating heart injury (with resultant hemopericardium) and other less frequent causes. The same causes ...



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