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10 Cards in this Set
- Front
- Back
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What features of birds enable them to live on land?
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lungs, wings, legs, beaks, internal fertilization, shelled, amniotic eggs, endothermic metabolism
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Describe how a bird’s respiratory system works, and explain how air sacs improve a bird’s ability to obtain the energy necessary for flight.
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Oxygen can enter a birds circulatory system when it inhales and exhales. Inhalation results in oxygen entering the lungs then entering air sacs. When a bird exhales, oxygenated air in the air sacs passes into the lungs, thereby increasing the amount of oxygen available to the bird to generate energy neede for flight.
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What is an endotherm? How does being an endotherm have adaptive value for birds that live in polar regions?
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Endotherms can regulate their body temperature regardless of the outside temperature
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Analyze the relationship between modern birds and dinosaurs.
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Most scientists think that modern birds evolved from theropod dinosaurs.
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Large, flightless birds once were common in areas that did not have large, carnivorous predators. Many of these birds are now extinct. Form a hypothesis about the evolution and extinction of large, flightless birds.
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Large flightless birds evolved in regions where there were few large carnivores. Extinction was probably caused by the introduction of large, carnivorous predators.
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Summarize the adaptations birds have that enable them to fly.
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-Feathers keep bird insulated and able to fly
-Wings generate lift needed for flight -Four chambered heart pumps rapidly, giving energy and oxygen needed for flight -Respiratory system constantly gives bird oxygen in the lungs, which gives it energy for flight -Endotherms, allows them to maintain high energy levels needed for flight |
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lightweight, modified scale found only on birds; provides insulation and enables flight.
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feather
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large breastbone that provides a site for muscle attachment; provides support for the thrust and power produced by birds as they generate motion for flight.
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sternum
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animal that maintains a constant body temperature and is not dependent on the environmental temperature.
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endotherm
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process of keeping eggs laid outside of the body warm; also involves periodic turning of the eggs to ensure proper development.
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incubate
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