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Unformatted text preview: behavioral, reproductive, and physiological characteristics Constraint – factor preventing full expression of a physiological or behavioral trait E.g. broiler size Every bird has an energy budget. This energy budget must be controlled physiologically, which is largely accomplished by the endocrine system. Endocrine – secretion of a gland that is transmitted by blood (in contrast to exocrine, secreted to the outside – sweat glands) WHAT ARE THE MAJOR ENDOCRINE GLANDS? We can see how endocrine processes drive various behaviors: Reproductive hormones control reproductive behaviors Stress hormones control fight or flight responses Thyroid hormones control metabolism and food intake Many hormones adjust immune function...
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- Spring '09
- Endocrine System, physiological trade-offs