Temperature regulation Define endotherm Define ectotherm Describe and explain the mechanism of temperature control in an endothermic mammal Including methods of heat production Conservation of heat Ways in which heat is lost Explain the role of the hypothalamus and the autonomic nervous system in temperature control. Describe and explain the mechanism of temperature control in an ectothermic reptile Compare and contrast the mechanisms in endotherms and ectotherms Blood glucose concentration
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- ECTOTHERMS are organisms that have a limited ability to control their body temperature. Their cellular activities generate little heat. Their body temperatures rise and fall with ambient temperature changes. Most organisms are ectotherms. Examples are plants‚ all invertebrates‚ fish‚ amphibians and reptiles - ENDOTHERMS are organisms whose metabolism generates enough heat to maintain an internal temperature independent of the ambient temperature. Examples are birds and mammals - EXTENSION (Not
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Australian Ectotherms and Endotherms- temperature regulation Part A :Types of Temperature regulation 1. Write down the meaning of the terms endotherm and ectotherm. Consult a textbook if necessary. a. endotherm Endotherms are animals that can maintain a constant internal body temperature. For instance mammals and birds are true endotherms that can maintain a constant internal body temperature b. ectotherm Ectotherms are animals that are not able to regulate their body temperature or in simple
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external environment Examples of homeostasis – Thermoregulation—the maintenance of internal temperature within narrow limits – Osmoregulation—the control of the gain and loss of water and solutes – Excretion—the disposal of nitrogen-containing wastes Copyright © 2009 Pearson Education‚ Inc. THERMOREGULATION Copyright © 2009 Pearson Education‚ Inc. 25.1 An animal’s regulation of body temperature helps maintain homeostasis Thermoregulation – The process by which animals maintain an internal
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animals whose organisms possess unique characteristics. When comparing the cat‚ of the class Mammalia‚ to that of the class Reptilia‚ five attributes that are quite different between the classes are their thermoregulation‚ epidermis‚ metabolic rate‚ reproduction‚ and body structure. Thermoregulation‚ for mammals and reptiles are the opposite of each other when compared together. As mammals are warm-blooded‚ which means reptiles are cold-blooded. Mammals are warm-blooded creatures‚ is where the internal
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Natural selection _________. a. results in evolutionary adaptation b. is the result of sampling error c. does not affect allelic frequencies d. prepares organisms for future changes in the environment e. causes changes in the genes of the individual Biologically speaking‚ fitness increases when an organism _______________. a. survives many hardships b. lives for a long time c. passes on a greater proportion of its genes to the next generation d. is disease free e. gets stronger The evolutionary history
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The Warm and Cold Blooded Nature of Dinosaurs The debate of whether dinosaurs were cold blooded or warm blooded has been ongoing since the beginning of the century. At the turn of the century scientists believed that dinosaurs had long limbs and were fairly slim‚ supporting the idea of a cold blooded reptile. Recently‚ however‚ the bone structure‚ number or predators to prey‚ and limb position have suggested a warm blooded species. In addition‚ the recent discovery of a fossilized dinosaur heart
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Maintaining a Balance 1. Most organism are active in a limited temperature range The role of Enzymes in metabolism‚ their chemical composition and specificity on substrates Role of enzymes * Enzymes are organic catalysts. They are protein molecules that increase the rate of the reactions in living organisms. * Without enzymes‚ metabolic reactions at body temperatures would be too slow to produce sufficient energy to maintain life * Intracellular enzymes are used in the cells
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Red Kangaroo: Macropus Rufus The Kangaroo is an endotherm. Endotherms generate heat from their body’s metabolism. So their internal body temperature is independent of the external temperature. Endotherms eat more food than ectotherms. This higher food intake results in an increased level of metabolism‚ which is required to produce heat. The Red Kangaroo inhabits inland plains throughout Australia. They prefer open plains where trees and bushes are scarce. The fur on Kangaroos maintains an insulating
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Effects of Temperature on Goldfish Respiration Introduction This experiment was designed to identify the effect of cold-water temperatures on the respiration rate of goldfish. The respiration rates helped to identify the goldfish as being ectotherms or endotherms. Organisms exchange gases with their environment through a process called respiration or breathing. Aerobic respiration‚ also known as aerobic metabolism‚ occurs when oxygen is taken into the body and sent to all its cells; the oxygen is
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