During Mammalian Labor and Delivery,the Contraction of Uterine Muscles Is

Multiple Choice

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.