Lecture 2 2011

Lecture 2 2011 - Lecture 2 Endocrinology basics...

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Lecture 2 Endocrinology basics
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Reproductive Tissue Reproductive tissues differ from other tissues in that they can offer no advantage to the animal’s individual survival. Instead they make tremendous demands such that total metabolism of the pregnant or laying animal must be altered.
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Homeostasis - maintenance of a physical comfort zone (maintenance of a constant internal environment). Compensatory reaction(s) initiated once outside of comfort zone. minute by minute basis Ex: practical: home heating and cooling Ex: biological: glucose levels
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Homeorhesis - Long term regulation in support of the dominant physiological state: pregnancy, lactation, starvation. More specifically, it is a form of physiologic regulation that permits major alterations in how animals expend their metabolic resources, particularly when shifting between distinct physiological states.
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Miescher in 1880 noted that salmon swimming up Rhine River are starving and loose over 50% of their body weight (mostly muscle) while testes/ovaries develop extensively during this period. Emperor penguin
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Lecture 2 2011 - Lecture 2 Endocrinology basics...

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