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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.


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. ...


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 ...


5

A good working theory is that this is caused by Rigor Mortis and the anatomy of insect legs. In most cases, the muscles that pull the leg down (or closer together) are larger than the ones that pull the leg up. This is because those muscles (flexors) must support the insect's weight: (Click for larger view) When the muscles contract after death, the ...


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

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

We human are scare of death. Because of that, we tend to apply that idea into everything we can observe, even if it's meaningless. But why is death scary? Isn't it because when you die, you stop function anymore? Fear of death is hard-wired into our nervous systems. A thirsty wildebeest will approach crocodile-infested water very, very reluctantly. The ...


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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