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| | Wildlife Habitats and Management Home Page |
 | | An underlying issue in the environmental relations of both homeotherms and poikilotherms is how well they can adjust to threats from extreme ambient temperatures through use of external objects. | | | Since our focus is on quadrupeds, we are concerned with both homeotherms and poikilotherms. | | | BODY SIZE AND METABOLIC RATE: Another key factor is the relationship between energy needs (through caloric intake) and body size. |
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http://www.fw.umn.edu/FW5603/lect9_thermal.htm
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| | Re: do scientists believe all dinosaurs were cold-blooded? |
| | Third, poikilotherms live at a slower pace than homeotherms; they don't use as much energy. | | | Second, mammals and birds have a different kind of bone than modern reptiles; they have spongy areas in their bones where blood cells were made, but modern reptile bone is denser. | | | However, dinosaurs were different from modern reptiles, and similar to modern mammals and birds, in ways that suggested they might have been homeotherms, or animals that use metabolism as well as behavior to regulate body temperature. |
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http://www.madsci.org/posts/archives/2001-02/983395292.Ev.r.html
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| | Lecture notes of Chapter 1 |
| | Describe the internal reflexive thermoregulatory responses of homeotherms 2. | | | Note: 1 kilocalories = enough heat to raise the temperature of 1000 grams of water 1 degree C. Internal reflexive thermoregulatory response of homeotherms See Transparency (1). | | | Homeotherms = warm blooded = gentlemen Mammals and birds are homeotherms, they remain an almost constant body temperature, range of 36 - 37.2 C degree. |
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http://www.humboldt.edu/~sh4/p321notech10.htm
(1970 words)
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| | DINOSAUR BRAINS AND BODY TEMPERATURE |
| | Homeotherms: keep their body temperatures within a limited range. | | | Observations: They've examined big theropods, big ornithnopods, and baby ornithopods, and in all cases, have found little evidence for temperature variations among skeletal parts. | | | Heterotherms: allow their body temperature to vary widely. |
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http://www.es.ucsc.edu/~pkoch/lectures/lecture15.html
(2749 words)
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| | Introduction to Human Physiology Part 1 |
| | As a consequence, mammals (and birds, which are also homeotherms) are able to achieve and sustain levels of physical activity and mental alertness generally far greater than those of animals whose temperatures rise and fall with that of their external environment. | | | More precisely, they are homeotherms; that is, they maintain a high and relatively constant body termperature. | | | They have hair or fur rather than scales or feathers. |
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http://home.earthlink.net/~dayvdanls/IHP1.html
(524 words)
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| | [No title] |
| | This is the opposite of what skin warm receptors do, and thus has the opposite affect: it makes you warmer. | | | -Poikilotherms do not regulate their body temperature by changing internal environment like homeotherms do. | | | Heat production Heat loss Metabolism blood flow to skin Shivering Sweating Exercise Non shivering thermogenesis Feedback mechanism for homeothermic regulation: Sensors: sense any deviation from set point. |
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http://eee.uci.edu/programs/biotutor/109/linh/ray109week1.doc
(1183 words)
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| | Current Research: Raul Suarez |
| | The anatomical and physiological correlates of these differences have been well studied, but the biochemical basis for them is poorly understood. | | | How do enzymes, pathways, and mitochondria really work in vivo? | | | When muscles work at their maximum power outputs, metabolic rates increase by up to several hundred-fold. |
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http://www.lifesci.ucsb.edu/eemb/faculty/suarez/research/research.html
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| | SAMPLE LAB REPORT |
| | In contrast, poikilothermic animals assume the temperature of their surroundings, and their only method of controlling their temperatures is by behavior. | | | In any case, these results were interpreted to mean that there is an inverse relationship between metabolic rate and body size in homeotherms, but not between homeotherms and poikilotherms, since the frogs were smaller. | | | Homeothermic mammals regulate their body temperatures, and hence their energy expenditure, to a relatively constant and fairly high rate (Fox, 1984). |
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http://csm.jmu.edu/biology/garrisne/Physiology/SampleReport.htm
(1010 words)
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| | Homeostatic Control Systems |
| | The others -- cold-blooded animals or poikilotherms -- differ from homeotherms in lacking the central autonomic thermal controls (the hypothalamus in mammals, and the spinal cord in birds), the continuously high body temperatures, and the emphasis on thermoregulation as a balance between metabolic heat and insulation (in the form of feathers or fur). | | | Both homeotherms and poikilotherms have biological stabilisation in the face of changing external temperature by homeostatic feed-back control mechanisms: in homeotherms it is the temperatures of particular parts of the body which are the controlled variables, whereas in poikilotherms the controlled variable might be, for example, metabolic rate [6, Chap. | | | However, poikilotherms can use many of the mechanisms detailed above to maintain a remarkably constant body temperature in their natural environments [21, 22]. |
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http://www.cogs.susx.ac.uk/users/adrianth/ecal97/node12.html
(1061 words)
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| | [No title] |
| | “Endotherm” means generating heat within the body, “homeotherm” means maintaining constant body temperature even if there is a change in external temperature. | | | Endothermic homeotherms might be found in an environment in which the external temperature is maintained constant, for example deep ocean environments. | | | Describe an environment in which you might find ectothermic homeotherms. |
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http://webpub.alleg.edu/employee/c/clundber/courses/bio220_S05/answers/09Temperature&WaterBalanceA.doc
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| | Margaret Judge |
| | The purpose of this experiment was to determine how the respiration rates of poikilotherms | | | Homeotherms maintain a constant internal body temperature, even when they are subjected to fluctuating environmental temperatures. | | | Therefore, it was expected that their respiration rates would increase when exposed to cold temperatures. |
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http://spot.colorado.edu/~basey/judge.html
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| | Lecture Notes-23 |
| | Blood flow can be regulated to control heat loss. | | | Mammals and birds maintain a constant body temperature (homeotherms = warm blooded): mammals about 37 deg C (99 deg F); birds about 40 deg C (105 deg F). | | | Warm blooded animals have many advantages- faster, more active, etc. |
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http://members.aol.com/Bio50/LecNotes/lecnot23.html
(1083 words)
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| | qz3 |
| | In a mammal, which of the following does not aid in the retention of body heat? | | | B) Thermoregulation is a characteristic of homeotherms but not endotherms. | | | D) Thermoregulation is a characteristic of ectotherms but not homeotherms. |
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http://www.sbs.utexas.edu/shankland/qz3.htm
(734 words)
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| | THERMOREGULATION |
| | Homeotherms thermoregulate by balancing gains and losses of heat | | | Another similar pair of terms people use is ectotherm and endotherm | | | Endotherms use an internal heat source: the heat released from chemical reactions in their cells |
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http://wildlife.wisc.edu/courses/318/2001/notes9-12-011.htm
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| | [No title] |
| | Body temperature in homeotherms (mammals and birds) is controlled by a complex system of sensory nerves, hormones, and continuous feedback from the body called | | | Since body temperature is controlled by hormones, changing the levels of some hormones can alter the temperature of the body. | | | Another is that by being able to control their body temperatures, homeotherms can run fevers, a good mechanism for killing invading microbes. |
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http://www.madsci.org/posts/archives/1998-02/884063084.Bc.r.html
(309 words)
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| | Temperature Regulation in Homeotherms |
| | They have the ability to regulate temperature via negative feedback control. | | | Other corrective mechanisms are involved, such as a drop in metabolic rate and shivering when temperatures drop. | | | Animals capable of temperature regulation within a given range are deemed homeotherms (alternatively homiotherms or homotherms). |
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http://academic.mu.edu/phys/buxtoni/DW/temperaturereg.htm
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| | Respiration Study Sheet |
| | Homeotherms are able to maintain their bodies (and the component cells thereof) at an optimal temperature for enzyme-catalyzed reaction rates. | | | Respiration is the process that enables organisms to release the chemical energy that is stored in food so that they can use it. | | | But, homeotherms require 10x to 30x as much food and oxygen as poikilotherms. |
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http://www.wsbd.net/biology/umn1009/bioss5.html
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| | ques.html |
| | 4) Describe some ways in which homeotherms conserve heat which are not covered in this lab. | | | 5) Describe some ways in which homeotherms lose excess heat which are not covered in this lab. | | | 6) What are the differences between homeothermic and poikliothermic animals. |
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http://www.accessexcellence.org:8080/LC/TE/PW/EXP/HEAT/ques.html
(156 words)
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| | APStracts 5:0158R, 1998. |
| | Hypothermia may limit asphyxic damages to the brain and many small homeotherms have been shown to use anapyrexic strategies when exposed to asphyxic conditions. | | | Larger homeotherms do not seem to use the same strategy, but could save oxygen and prevent hypoxic brain damage by employing selective brain cooling (SBC) in connection with asphyxia. | | | To test the hypothesis that selective brain cooling may take place in connection with asphyxia we have recorded brain (hypothalamic - THyp) and body (colonic - TC) temperatures and heart rates in four Pekin ducks during 5-min simulated (head submersion) diving in cold water (10(C). |
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http://www.uth.tmc.edu/apstracts/1998/regulatory/April/158R.html
(262 words)
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| | Biology Tutorials |
| | The principle of negative feedback control and its importance, especially in homeotherms for temperature regulation for biological reactions to occur in an optimum environment | | | The regulation of water concentration in cells via the principles of negative feedback control. | | | The regulation of temperature in homeotherms by homeostasis. |
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http://www.biology-online.org/tutorials/4_biological_regulation.htm
(190 words)
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| | Influence of Chemical and Biological Factors on Trophic Transfer of Persistent Organic Pollutants in the Northwater ... |
| | Greater biomagnification in homeotherms was attributed to their greater energy requirement and subsequent feeding rates. | | | Strong positive relationships were found between recalcitrant POP concentrations (lipid corrected) and trophic level based on stable isotopes of nitrogen, providing clear evidence of POP biomagnification in Arctic marine food webs. | | | Within the homeotherms, seabirds had greater BMFs than ringed seals, consistent with greater energy demands in birds. |
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http://pubs.acs.org/cgi-bin/jtext?esthag/35/i04/abs/es001459w
(382 words)
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| | Summary ecol1- |
| | Where do homeotherms and poikilotherms get heat to regulate body temperature? | | | Organisms can be divided into two major categories based on their response to variation in temperature | | | How do homeotherms and poikilotherms respond to variation in temperature? |
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http://www.bio.georgiasouthern.edu/Bio-home/George-Sophie/Summary-ecol.html
(539 words)
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| | Food Web Magnification of Persistent Organic Pollutants in Poikilotherms and Homeotherms from the Barents Sea |
| | It is preferable to calculate FWMFs with regard to thermal groups, because the different energy requirements and biotransformation abilities between poikilotherms and homeotherms may give different rates of contaminant increase with trophic level. | | | Some compounds, such as trans-nonachlor and HCB, had similar rates of increase throughout the food web, whereas compounds that are more readily eliminated ( | | | These compounds had significantly higher rates of increase per trophic level in homeotherms relative to poikilotherms, with the highest food web magnification factors (FWMFs) for cis-chlordane and p,p'-DDE. |
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http://pubs.acs.org/cgi-bin/jtext?esthag/36/i12/abs/es010231l
(300 words)
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| | The Metabolic Cost of Swimming in Marine Homeotherms (ResearchIndex) |
| | The model takes account of both hydrodynamic and thermal processes. | | | Online articles have much greater impact More about CiteSeer Add search form to your site Submit documents Feedback | | | Abstract: This paper describes a model of the metabolic cost of swimming in pinnipeds and its application to other marine homeotherms. |
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http://citeseer.ifi.unizh.ch/hind97metabolic.html
(514 words)
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| | Shark Anatomy - Enchanted Learning Software |
| | Hot-blooded animals (homeotherms) generate heat internally and maintain a relatively constant body temperature (higher than the average temperature of the environment). | | | These sharks can raise their temperature about the temperature of the water; they need to have occasional short bursts of speed in hunting. |
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http://www.zoomschool.com/subjects/sharks/anatomy/Blood.shtml
(190 words)
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| | Ecoscience |
| | However, the ratio found in the allometric relationships between FMR:BMR ratio and body mass for the three groups of homeotherms could be indicative of trends in estimating FMR from BMR. | | | The use of a constant FMR:BMR ratio to estimate FMR from BMR, as is commonly done, could result in erronoeus results. | | | Buy the publication with viewing rights (prints at low resolution): 4.97 $ |
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http://www.ecoscience.ulaval.ca/catalogue/E_detail.php?retour=53&id=537
(264 words)
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| | Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations |
| | Availability information may be found in the Availability, Publisher, Research Organization, Resource Relation and/or Author (affiliation information) fields and/or via the "Full-text Availability" link. | | | For a journal article, please see the Resource Relation field. | | | Energy Citations Database (ECD) Document #5986110 - Biological half-time of radioactive Cs in poikilothermic and homeothermic animals |
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http://www.osti.gov/energycitations/product.biblio.jsp?osti_id=5986110
(100 words)
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| | homeotherms - OneLook Dictionary Search |
| | We found 2 dictionaries with English definitions that include the word homeotherms: | | | Tip: Click on the first link on a line below to go directly to a page where "homeotherms" is defined. |
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http://www.onelook.com/?w=homeotherms
(60 words)
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