Oxytocin helps initiate labor in mammals. During labor and delivery, the contraction of uterine muscles increases the release of oxytocin. This is an example of ________.
A) a negative feedback system
B) a hormone that acts in an antagonistic way with another hormone
C) a hormone that is involved in a positive feedback loop
D) signal transduction immediately changing gene expression in its target cells
E) the key role of the anterior pituitary gland in regulating uterine contraction
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