Consider the positive feedback regulating mammalian childbirth. In this process, the pituitary gland is _________, oxytocin is __________, and a uterine contraction is __________
A. the sensor; the effector; both the stimulus
and response
B. the effector; the sensor; both the stimulus
and response
C. both the stimulus and response; the
effector; the sensor
D. both the stimulus and response; the
sensor; the effector
A
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