GLY1102 Topic 30
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Most ectotherms have sprawling postures
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True
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Ectothermic animals maintain a body temperature at 36-40 degrees C.
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False
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Endotherms require great motor and sensory control which is associated with larger and more complex brains.
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True
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The density of blood vessels in bone is higher in all ectotherms than in endotherms.
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False
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Mammals have a fully divided four-chambered heart and numerous fossil dinosaur hearts have only two chambers
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False
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Today feathers are only found on endothermic birds.
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True
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Dinosaurs have complex scrolls of thin bone within the nasal cavity (turbinates) once covered with mucous membranes.
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False
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Most endotherms are egg-layers.
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False
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The optimum temperature of mammals is usually lower than those in the environment around them.
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False
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Endotherms require more food per body weight than is the case for ectotherms.
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True
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One dinosaur researcher, Dr. Bakker, finds the predator/herbivore dinosaur ratios similar to Cenozoic mammal (endothermic) populations and interpreted this as strong evidence for endothermy.
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True
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Endothermic predator- prey ratios should be lower than for ectotherms.
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True
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Most endotherms have an erect gait.
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True
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Endotherms require high blood pressure and rapid blood circulation to allow against oxygen and energy to circulate quickly through the body.
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True
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Ectothermic animals develop their heat from the external environment rather than metabolic sources.
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True
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Endotherms must eat more food per body volume than ectotherms because of their higher level of activity.
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True
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Growth rings occur in all living endotherms because of a seasonal pause in bone growth as food supplies are limited or climate unfavorable.
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False
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Many dinosaurs have lamellar-zonal bone (growth rings), a common characteristic of living ectotherms with seasonal pauses in their growth.
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True
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Large ectothermic dinosaurs would have more trouble maintaining a constant body temperature than smaller ones because of their large body volume.
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False
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The rate of metabolic reactions depends on the internal body temperature.
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True
