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Basic Principles of Animal Form and Function

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Chapter Forty: Basic Principles of Animal Form and Function Preface A jackrabbit?s ear not only provide the animal with an acute sense of hearing but also help it shed excess heat via the blood flowing in each ears network vessels which transfers heat into surrounding air. When air is warmer than jackrabbit (exceeding 40? C), the jackrabbit?s pink ears turn pale, reflecting a narrowing of the blood vessels in response to the environment allowing their ears to absorb heat without affecting the rest of the body. Once the air cools, blood flow increases again, helping to release heat. Anatomy: Study of biological structure Physiology: Study of biological function
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