Estrogen levels cause both increased and decreased hormone secretions from the anterior pituitary and hypothalamus at various points in the menstrual cycle. This indicates that ________.
A. estrogen is involved in both positive and negative feedback with the anterior pituitary and hypothalamus
B. estrogen is secreted in consistent amounts from the ovaries throughout the menstrual cycle
C. estrogen is not involved in any feedback loops
D. the ovaries serve as the integrating center in a feedback loop with the anterior pituitary and hypothalamus
Answer: D
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