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Warm Bodies Official Trailer #1 (2013) - Zombie Movie HD
Warm Bodies Official Trailer #1 (2013) - Zombie Movie HD
Published: 2012/11/09
Channel: Movieclips Trailers
Warm-Blooded vs. Cold-Blooded: What’s The Difference?
Warm-Blooded vs. Cold-Blooded: What’s The Difference?
Published: 2015/05/12
Channel: Seeker
Warm or Cold Blooded Animals | Learn the Difference
Warm or Cold Blooded Animals | Learn the Difference
Published: 2016/06/10
Channel: Kids Learning Videos
Why Warm Blood is Better Than Cold
Why Warm Blood is Better Than Cold
Published: 2015/08/21
Channel: Smithsonian Channel
Carly Rae Jepsen - Warm Blood (Audio)
Carly Rae Jepsen - Warm Blood (Audio)
Published: 2015/07/31
Channel: CarlyRaeJepsenVEVO
Cold Blood Versus Warm Blood - Science on the Web #12
Cold Blood Versus Warm Blood - Science on the Web #12
Published: 2013/06/26
Channel: Stuff to Blow Your Mind - HowStuffWorks
Could Dinosaurs Have Been Warm-Blooded?
Could Dinosaurs Have Been Warm-Blooded?
Published: 2015/08/17
Channel: SciShow
OPAH - first warm blooded fish
OPAH - first warm blooded fish
Published: 2016/01/06
Channel: Sarabjot Singh
Why Are Some People Always Cold?
Why Are Some People Always Cold?
Published: 2014/11/26
Channel: Seeker
Sharks Aren
Sharks Aren't Cold-Blooded Killers... They're Warm-Blooded Ones
Published: 2014/12/05
Channel: Smithsonian Channel
Foreigner - Hot Blooded (Official Lyric Video)
Foreigner - Hot Blooded (Official Lyric Video)
Published: 2013/07/09
Channel: ForeignerVEVO
Researchers Find First Warm Blooded Fish
Researchers Find First Warm Blooded Fish
Published: 2015/05/15
Channel: ShantiUniverse
Nym - Warm Blooded Lizard (2011) - Full Album [HQ]
Nym - Warm Blooded Lizard (2011) - Full Album [HQ]
Published: 2015/06/03
Channel: yairushalmi
What evidence is there for Warm Blooded Dinosaurs?
What evidence is there for Warm Blooded Dinosaurs?
Published: 2016/04/07
Channel: Benjamin Burger
An In depth Comparison of Cold blooded and Warm blooded Animals
An In depth Comparison of Cold blooded and Warm blooded Animals
Published: 2017/03/11
Channel: Animals & Pets
flor - warm blood
flor - warm blood
Published: 2015/07/04
Channel: GalaxyMusic
Palisades - Cold Heart (Warm Blood)
Palisades - Cold Heart (Warm Blood)
Published: 2017/01/20
Channel: riserecords
First warm blooded fish discovered
First warm blooded fish discovered
Published: 2015/05/15
Channel: новости
Meet Opah - The First Fully Warm-Blooded Fish
Meet Opah - The First Fully Warm-Blooded Fish
Published: 2015/05/14
Channel: GeoBeats News
Classification, Lesson 2, Cold Blooded and Warm Blooded Animals
Classification, Lesson 2, Cold Blooded and Warm Blooded Animals
Published: 2016/08/28
Channel: MissMillar3
Dinosaurs: warm blooded vs cold blooded - Horizon - My Pet Dinosaur - BBC
Dinosaurs: warm blooded vs cold blooded - Horizon - My Pet Dinosaur - BBC
Published: 2009/10/16
Channel: BBCExplore
Scientists Discover World
Scientists Discover World's First Warm-Blooded Fish
Published: 2015/05/15
Channel: United News International
Meet The Opah, The First Known Warm-Blooded Fish
Meet The Opah, The First Known Warm-Blooded Fish
Published: 2015/05/15
Channel: Newsy Science
Mandela Effect: Warm blooded fish and Reptiles
Mandela Effect: Warm blooded fish and Reptiles
Published: 2017/02/04
Channel: Scott Harrison
Study Points To Possible Warm-Blooded Nature Of Dinosaurs
Study Points To Possible Warm-Blooded Nature Of Dinosaurs
Published: 2015/05/28
Channel: GeoBeats News
Warm and Cold – Blooded Pigeons Breed – Warm – Blooded vs. Cold Blooded
Warm and Cold – Blooded Pigeons Breed – Warm – Blooded vs. Cold Blooded
Published: 2017/06/05
Channel: Raja Farhan
Were Dinosaurs Warm-Blooded?
Were Dinosaurs Warm-Blooded?
Published: 2012/09/24
Channel: American Museum of Natural History
Despised Icon - Warm Blooded
Despised Icon - Warm Blooded
Published: 2009/03/24
Channel: DrummerShot
Study Suggests that Dinosaurs were Warm-Blooded
Study Suggests that Dinosaurs were Warm-Blooded
Published: 2015/05/28
Channel: Stony Brook University
Warm Blooded Enigma
Warm Blooded Enigma
Published: 2016/10/05
Channel: Jared Tan
Cryptopsy- Cold Hate, Warm Blood
Cryptopsy- Cold Hate, Warm Blood
Published: 2012/09/11
Channel: Murderotica
Jacques Cousteau Odyssey The Warm Blooded Sea: Mammals of the Deep
Jacques Cousteau Odyssey The Warm Blooded Sea: Mammals of the Deep
Published: 2016/09/22
Channel: George Martinez
Dinosaurs were Mesotherms, neither warm nor cold blooded
Dinosaurs were Mesotherms, neither warm nor cold blooded
Published: 2014/06/13
Channel: The Cosmos News
Cold-blooded vs. Warm-blooded
Cold-blooded vs. Warm-blooded
Published: 2015/04/20
Channel: Amber Struthers
cold and warm blooded animals
cold and warm blooded animals
Published: 2014/08/25
Channel: Michelle Karyono
The Opah Researchers discover world
The Opah Researchers discover world's first warm blooded fish,Moonfish
Published: 2016/10/13
Channel: UFO 2016
How do cold blooded animals stay warm?
How do cold blooded animals stay warm?
Published: 2015/02/07
Channel: World of Warmth
Hot Springs And A Warm Blooded Woman
Hot Springs And A Warm Blooded Woman
Published: 2013/11/28
Channel: Brent Gardella
Were Dinosaurs Warm Blooded?
Were Dinosaurs Warm Blooded?
Published: 2010/05/28
Channel: Dave Flang
Despised Icon - Warm Blooded Demo
Despised Icon - Warm Blooded Demo
Published: 2012/04/17
Channel: Evan Arciniega
Homeostasis 1: Thermoregulation cold blooded vs warm blooded.
Homeostasis 1: Thermoregulation cold blooded vs warm blooded.
Published: 2015/09/08
Channel: m j murcott
Despised Icon LIVE Warm Blooded - Berlin, Germany 2008-02-13
Despised Icon LIVE Warm Blooded - Berlin, Germany 2008-02-13
Published: 2008/02/15
Channel: Bahomar
A WARM BLOODED TURTLE
A WARM BLOODED TURTLE
Published: 2012/06/14
Channel: Dave Flang
Warm Blooded Killers
Warm Blooded Killers
Published: 2012/01/04
Channel: carl0ssp1cyw1ener
.Warm Blooded Animals are delicious,
.Warm Blooded Animals are delicious,
Published: 2015/03/14
Channel: Peter Caine Dog Training
Warm vs Cold Blooded
Warm vs Cold Blooded
Published: 2015/12/18
Channel: Table Cape Primary
Flo Mounier rehearsing Cold Hate, Warm Blood
Flo Mounier rehearsing Cold Hate, Warm Blood
Published: 2008/05/25
Channel: CursedToExist
Warm-blooded Meaning
Warm-blooded Meaning
Published: 2015/04/21
Channel: SDictionary
warm and cold blooded animals
warm and cold blooded animals
Published: 2015/03/15
Channel: Takata Science
Skip
Skip's Cold or Warm-blooded Haitiensis Cichlid Theory
Published: 2015/05/21
Channel: fishlaw1
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WIKIPEDIA ARTICLE

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Thermographic image: an ectothermic snake is eating an endothermic mouse

Warm-blooded animal species can maintain a body temperature higher than their environment. In particular, homeothermic species maintain a stable body temperature by regulating metabolic processes. The only known homeotherms are birds and mammals. Other species have various degrees of thermoregulation.

Animal body temperature control varies by species, so the terms "warm-blooded" and "cold-blooded" (though still in everyday use) suggest a false idea of there being only two categories of body temperature control, and are no longer used scientifically.

Terminology[edit]

In general, warm-bloodedness refers to three separate categories of thermoregulation.

  • Endothermy is the ability of some creatures to control their body temperatures through internal means such as muscle shivering or increasing their metabolism (Greek: ἔνδον endon "within" θέρμη thermē "heat"). Some writers[who?] restrict the meaning of endothermy to mechanisms that directly raise the animal's metabolic rate to produce heat. The opposite of endothermy is ectothermy.
  • Homeothermy maintains a stable internal body temperature regardless of external influence and temperatures. The stable internal temperature is often higher than the immediate environment (Greek: ὅμοιος homoios "similar", θέρμη thermē "heat"). The opposite is poikilothermy. Mammals and birds are homeothermic.
  • Tachymetabolism maintains a high "resting" metabolism (Greek: ταχύς tachys/tachus "fast, swift", μεταβάλλειν metaballein "turn quickly"). In essence, tachymetabolic creatures are "on" all the time. Though their resting metabolism is still many times slower than their active metabolism, the difference is often not as large as that seen in bradymetabolic creatures. Tachymetabolic creatures have greater difficulty dealing with a scarcity of food.

The variety of thermoregulation types[edit]

A large proportion of the creatures traditionally called "warm-blooded", like birds and mammals, fit all three of these categories (i.e., they are endothermic, homeothermic, and tachymetabolic). However, over the past 30 years, studies in the field of animal thermophysiology have revealed many species belonging to these two groups that do not fit all these criteria. For example, many bats and small birds are poikilothermic and bradymetabolic when they sleep for the night (or, in nocturnal species, for the day). For these creatures, the term heterothermy was coined.

Further studies on animals that were traditionally assumed to be cold-blooded have shown that most creatures incorporate different variations of the three terms defined above, along with their counterparts (ectothermy, poikilothermy, and bradymetabolism), thus creating a broad spectrum of body temperature types. Some fish have warm-blooded characteristics, such as the opah. Swordfish and some sharks have circulatory mechanisms that keep their brains and eyes above ambient temperatures and thus increase their ability to detect and react to prey.[1][2][3] Tunas and some sharks have similar mechanisms in their muscles, improving their stamina when swimming at high speed.[4]

Heat generation[edit]

Body "heat" is generated by metabolism. This refers to the chemical reactions cells use to break down glucose into water and carbon dioxide and, in so doing, generate ATP (adenosine triphosphate), a high-energy compound used to power other cellular processes. Muscle contraction is a type of metabolic process that generates heat energy, and heat is also generated through friction when blood flows through the circulatory system.

All organisms metabolize food and other inputs, but some make better use of the output than others. Like all energy conversions, metabolism is rather inefficient, and around 60% of the available energy is converted to heat rather than to ATP. In most organisms, this heat is simply lost to the environment. However, endothermic homeotherms (the animals generally characterized as "warm-blooded") both produce more heat and have better ways to retain and regulate it than other animals. They have a higher basal metabolic rate, and also a greater capacity to increase their metabolic rate when engaged in strenuous activity. They usually have well-developed insulation in order to retain body heat, fur in the case of mammals and feathers in birds. When this insulation is insufficient to maintain body temperature, they may resort to shivering—rapid muscle contractions that quickly use up ATP, thus stimulating cellular metabolism to replace it and consequently produce more heat. In general, in hot environments, they use evaporative cooling to shed excess heat, either by sweating (some mammals) or by panting (many mammals and all birds)—in general, mechanisms not present in poikilotherms.

Defense against fungi[edit]

It has been hypothesized that mammals and birds evolved warm-bloodedness as a defense against fungal infections. Very few fungi can survive the body temperatures of warm-blooded animals. By comparison, insects, reptiles, and amphibians are plagued by fungal infections.[5]

References[edit]

  1. ^ Hot Eyes for Cold Fish -- Wong 2005 (110): 2 -- ScienceNOW
  2. ^ Block, B.A. & Carey, F.G. (March 1985). "Warm brain and eye temperatures in sharks". Journal of Comparative Physiology B. Springer. 156 (2): 229. doi:10.1007/BF00695777. 
  3. ^ "Warm eyes give deep-sea predators super vision". University of Queensland. 11 January 2005. 
  4. ^ McFarlane, P. (January 1999). "Warm-Blooded Fish". Monthly Bulletin of the Hamilton and District Aquarium Society. 
  5. ^ Dunn, Rob (2011). "Killer Fungi Made us Hotblooded". New Scientist. Retrieved 27 April 2016. (subscription required)

External links[edit]

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