During mammalian labor and delivery,the contraction of uterine muscles is enhanced partly by the actions of oxytocin.This is an example of
A) a negative feedback system.
B) a hormone that is involved in a positive feedback loop.
C) signal transduction immediately changing gene expression in its target cells.
D) the key role of the anterior pituitary gland in regulating uterine contraction.
Correct Answer:
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