Vertebrata-aves - a. systemic now separated to avoid mixing...

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Vertebrata-Aves A. characteristics 1. Feathers- only birds a. used for flight b. keep in body heat c. keep in body moisture 2. Anterior limbs, and posterior limbs- serve different functions a. Anterior limbs- flight, (except: ostrage- vestigial, penguin- swimming) b. Posterior limbs- Walking, swimming, perching 3. Other adaptations for flight a. Compact, streamlined body b. fusion of bones, adds rigidity c. jaw- made of horn, not bone, no teeth - makes bird lighter d. Hollow bones- makes bird lighter e. Lungs- extensions (air sacs) go between bones to keep hollow and between organs to keep from filling up with fluid. 4. Heart- 4 chambered
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Unformatted text preview: a. systemic now separated to avoid mixing b. pulmonary of oxygenated and deoxygenated blood 5. Metabolic rate- high a. homoeothermic- “warm blooded” or “endothermic” 6. Excretion a. Uric Acid- advantage to urinary bladder, not holding water, makes birds lighter 7. Digestion a. Stomach- crop- thin walled, for storage- gizzard- thick walled, for grinding i. some birds eat pebbles to help grind 8. Reproduction a. Internal fertilization b. oviparous c. birds have to incubate eggs because warm blooded 9. Scales- on their legs a. remnants of reptilian ancestry b. feathers evolved from scales...
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This note was uploaded on 04/07/2008 for the course BS 131 taught by Professor Smith during the Spring '08 term at University of the Sciences in Philadelphia.

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Vertebrata-aves - a. systemic now separated to avoid mixing...

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