Although Estrogen Is Primarily Produced by Ovaries,it Is Also Produced

question 52

Multiple Choice

Although estrogen is primarily produced by ovaries,it is also produced by the adrenal glands and in fat tissue.Loss of the normal amount of fat lowers the level of estrogen so that the menstrual cycle and ovulation stops.Female Olympic athletes who train severely often shut off their cycles.What would be a reasonable evolutionary cause of this shutdown?

• A)This mechanism shifts use of energy from reproduction to life activities for staying alive.
• B)Since an unborn infant gets priority on blood nutrient pools,pregnancy during famine will likely be fatal for both mother and offspring; this mechanism reduces this risk and increases survival.
• C)The adrenal glands have evolved to produce fight-or-flight responses and natural selection has shifted them to this function and away from estrogen.
• D)Less food would result in less hormone production.
• E)Evolution always selects for simpler systems.

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