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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 Bodies Official Trailer #1 (2013) - Zombie Movie HD
Warm Bodies Official Trailer #1 (2013) - Zombie Movie HD
Published: 2012/11/09
Channel: Movieclips Trailers
Why Warm Blood is Better Than Cold
Why Warm Blood is Better Than Cold
Published: 2015/08/21
Channel: Smithsonian Channel
Warm or Cold Blooded Animals | Learn the Difference
Warm or Cold Blooded Animals | Learn the Difference
Published: 2016/06/10
Channel: Kids Learning Videos
Carly Rae Jepsen - Warm Blood (Audio)
Carly Rae Jepsen - Warm Blood (Audio)
Published: 2015/07/31
Channel: CarlyRaeJepsenVEVO
Why Are Some People Always Cold?
Why Are Some People Always Cold?
Published: 2014/11/26
Channel: Seeker
Could Dinosaurs Have Been Warm-Blooded?
Could Dinosaurs Have Been Warm-Blooded?
Published: 2015/08/17
Channel: SciShow
Warm Blooded Killers
Warm Blooded Killers
Published: 2012/01/04
Channel: carl0ssp1cyw1ener
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
Sharks Aren
Sharks Aren't Cold-Blooded Killers... They're Warm-Blooded Ones
Published: 2014/12/05
Channel: Smithsonian Channel
Despised Icon - Warm Blooded
Despised Icon - Warm Blooded
Published: 2009/03/24
Channel: DrummerShot
SCIENTISTS DISCOVER FIRST WARM BLOODED FISH
SCIENTISTS DISCOVER FIRST WARM BLOODED FISH
Published: 2015/06/19
Channel: billschannel
Meet Opah - The First Fully Warm-Blooded Fish
Meet Opah - The First Fully Warm-Blooded Fish
Published: 2015/05/14
Channel: GeoBeats News
Nym - Warm Blooded Lizard (2011) - Full Album [HQ]
Nym - Warm Blooded Lizard (2011) - Full Album [HQ]
Published: 2015/06/03
Channel: RetroVintageOldSchool
Warm Blooded
Warm Blooded
Published: 2017/11/18
Channel: Despised Icon - Topic
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
Study Suggests that Dinosaurs were Warm-Blooded
Study Suggests that Dinosaurs were Warm-Blooded
Published: 2015/05/28
Channel: Stony Brook University
Dinosaurs were Mesotherms, neither warm nor cold blooded
Dinosaurs were Mesotherms, neither warm nor cold blooded
Published: 2014/06/13
Channel: The Cosmos News
First warm-blooded fish discovered
First warm-blooded fish discovered
Published: 2015/05/15
Channel: CNN
Dinosaurs: warm blooded vs cold blooded - My Pet Dinosaur - BBC
Dinosaurs: warm blooded vs cold blooded - My Pet Dinosaur - BBC
Published: 2009/03/20
Channel: BBCWorldwide
Classification, Lesson 2, Cold Blooded and Warm Blooded Animals
Classification, Lesson 2, Cold Blooded and Warm Blooded Animals
Published: 2016/08/28
Channel: MissMillar3
What evidence is there for Warm Blooded Dinosaurs?
What evidence is there for Warm Blooded Dinosaurs?
Published: 2016/04/07
Channel: Benjamin Burger
First Warm-Blooded Fish Discovered: The Opah (Lampris guttatus) Traps Its Own Heat In The Deep
First Warm-Blooded Fish Discovered: The Opah (Lampris guttatus) Traps Its Own Heat In The Deep
Published: 2015/05/15
Channel: AmazingWorldNews
Palisades - Cold Heart (Warm Blood)
Palisades - Cold Heart (Warm Blood)
Published: 2017/01/20
Channel: riserecords
Cryptopsy- Cold Hate, Warm Blood
Cryptopsy- Cold Hate, Warm Blood
Published: 2012/09/11
Channel: Murderotica
.Warm Blooded Animals are delicious,
.Warm Blooded Animals are delicious,
Published: 2015/03/14
Channel: Peter Caine Dog Training
Despised Icon - Warm Blooded Demo
Despised Icon - Warm Blooded Demo
Published: 2012/04/17
Channel: Evan Arciniega
flor - warm blood
flor - warm blood
Published: 2015/07/04
Channel: GalaxyMusic
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
Researchers Find First Warm Blooded Fish
Researchers Find First Warm Blooded Fish
Published: 2015/05/15
Channel: ShantiUniverse
cold and warm blooded animals
cold and warm blooded animals
Published: 2014/08/25
Channel: Michelle Karyono
Despised Icon - warm blooded Alexgrind
Despised Icon - warm blooded Alexgrind
Published: 2007/08/08
Channel: alexgrind
Mandela Effect: Warm blooded fish and Reptiles
Mandela Effect: Warm blooded fish and Reptiles
Published: 2017/02/04
Channel: Scott Harrison
Were Dinosaurs Warm-Blooded?
Were Dinosaurs Warm-Blooded?
Published: 2012/09/24
Channel: American Museum of Natural History
A Minute with Nature: Warm-Blooded and Cold-Blooded Animals
A Minute with Nature: Warm-Blooded and Cold-Blooded Animals
Published: 2017/08/08
Channel: CivicCenterTV15
Opah is First Warm Blooded Fish ever Discovered with Unique ability to flap fins to generate heat
Opah is First Warm Blooded Fish ever Discovered with Unique ability to flap fins to generate heat
Published: 2015/05/15
Channel: PatrynWorldLatestNew
Cerberus Unchained - Warm Blooded Beast
Cerberus Unchained - Warm Blooded Beast
Published: 2016/10/12
Channel: UnknownMelodeath
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
Nym - Warm Blooded Lizard - 14 - Hanging
Nym - Warm Blooded Lizard - 14 - Hanging
Published: 2011/03/09
Channel: Nym
Jyotiraditya Scindia warm blooded Speech in gujrat
Jyotiraditya Scindia warm blooded Speech in gujrat
Published: 2017/11/17
Channel: WE Love BABA SAHEB
Nym - Warm Blooded Lizard - 09 - Cuckoo
Nym - Warm Blooded Lizard - 09 - Cuckoo
Published: 2011/03/09
Channel: Nym
Warm Blooded and Cold Blooded
Warm Blooded and Cold Blooded
Published: 2016/12/12
Channel: 24by7exams
Despised Icon - Warm Blooded
Despised Icon - Warm Blooded
Published: 2009/03/19
Channel: the1fallen2hero3
Warm-blooded and cold-blooded Animals
Warm-blooded and cold-blooded Animals
Published: 2017/11/28
Channel: Kelly Allison
Despised Icon - Warm Blooded
Despised Icon - Warm Blooded
Published: 2009/06/03
Channel: slipknotfan22511
Warm-Blooded
Warm-Blooded
Published: 2016/06/10
Channel: Felt Hat - Topic
Nym - Warm Blooded Lizard - 07 - Rats!
Nym - Warm Blooded Lizard - 07 - Rats!
Published: 2011/03/09
Channel: Nym
Warm-blooded Meaning
Warm-blooded Meaning
Published: 2015/04/21
Channel: SDictionary
Jacques Cousteau Odyssey The Warm Blooded Sea: Mammals of the Deep
Jacques Cousteau Odyssey The Warm Blooded Sea: Mammals of the Deep
Published: 2017/04/01
Channel: Donald Hoggins
Scientists Discover World
Scientists Discover World's First Warm-Blooded Fish
Published: 2015/05/15
Channel: United News International
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WIKIPEDIA ARTICLE

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Thermographic image: an ectothermic snake is eating an homeothermic 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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