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Author Topic: Thermoregulation  (Read 225 times)

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AGelbert

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Thermoregulation
« on: November 20, 2013, 09:43:00 pm »


How Do Rats Regulate Body Temperature?

Rather than sweating, rats regulate their body temperature through blood vessels in their tails. The blood vessels dilate and constrict in a process known as thermoregulation. As a rat’s body temperature rises, the blood vessels in its tail swell so that warm blood moves through the vessels to the surface of the tail, where the temperature of the blood is reduced. The cooled blood then flows back to the body, thus lowering the rat’s body temperature. A rat’s tail disperses about 17% of the rodent’s body heat, even though the tail has only 5% of a rat’s surface area.

More about rats:

Rats can survive being flushed down a toilet, because they can tread water for as long as three days.
There is estimated to be as many rats in the United States as there are people. ;D

A pair of brown rats are thought to be able to produce offspring at a rate of 2,000 rats per year.

http://www.wisegeek.com/how-do-rats-regulate-body-temperature.htm

Agelbert NOTE: Does this mean rats have to grow longer tails to survive Global Warming? 

Jokes about the Predatory Corporate Capitalist Crusader R.A.T.S. (Roberts, Alito Thomas, Scalia)   on the supreme Court WELCOME!



                                       

               Bigots  On the Bench
But Peter said unto him, Thy money perish with thee, because thou
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AGelbert

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Re: Thermoregulation
« Reply #1 on: November 21, 2018, 02:52:58 pm »

How Do Swordfish Catch Prey in the Cold Ocean Depths? 

Marine biologists have long been aware that some ocean predators, such as tuna and sharks 🦈,  are able to warm their eyes and brains 👀 while hunting for prey in cold underwater environments. But they didn’t know why until a groundbreaking study about swordfish from the University of Queensland in Australia revealed a likely explanation. That research determined that warming of their retinas allow swordfish to distinguish light flashes associated with prey movement more accurately. This improved their ability to see moving images and track their prey by as much as 10 times, the researchers found.


Warmer eyes, better hunting:

֍ It is common to find swordfish in the Pacific Ocean at a depth of 984 feet (300 m), where the temperature can be as low as 37°F (3°C).

֍ Temperature “must affect transmission speed in nerves and other molecular and neurochemical processes, slowing the whole nerve response down,” the researchers said.

֍ Contrary to popular belief, a swordfish’s "sword" is not used to spear prey, but used instead to slash at its prey. Once injured, the prey is easier to catch.

https://www.wisegeek.com/how-do-swordfish-catch-prey-in-the-ocean-depths.htm
But Peter said unto him, Thy money perish with thee, because thou
hast thought that the gift of God may be purchased with money. Acts 8:20

AGelbert

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Do Zebra 🦓 Stripes Serve a Practical Purpose?
« Reply #2 on: July 24, 2019, 12:31:18 pm »

Do Zebra 🦓 Stripes Serve a Practical Purpose?

Scientists may never understand exactly why zebras have stripes, but 2019 research published in the Journal of Natural History suggests a plausible answer. The alternating black and white markings on zebras may be part of a cooling system that creates a current of air -- the result of convection -- that acts like a fan, helping their frothy sweat to evaporate and keeping the animals cooler. Alison and Stephen Cobb measured the temperature of the different color stripes on two zebras during a hot and sunny day in Kenya. They found that the black stripes absorbed more heat, causing a small-scale convective air movement that cooled the animals through the evaporative process.

Why zebras earned their stripes:

► The researchers also discovered that zebras can raise the hair on their black stripes, while the white ones remain flat, helping trigger the evaporation.

► The researchers concluded that the three components -- convective air movements, frothy sweat, and hair raising -- combine to wick the sweat away from their skin and help them cool down.

► Previous studies have suggested that the stripes are a form of camouflage, even though zebras spend large periods of time out in the open. Another study posited that the alternating colors disorient 🙃 blood-sucking horse flies.

https://www.wisegeek.com/do-zebra-stripes-serve-a-practical-purpose.htm
But Peter said unto him, Thy money perish with thee, because thou
hast thought that the gift of God may be purchased with money. Acts 8:20

 

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