The correct answer is:
A- positive feedback;
B- positive feedback;
C- negative feedback;
D- positive feedback;
E- negative feedback;
F- positive feedback
A positive feedback increases the stimulus that generates imbalance, making the values increasingly different from the standard.
A negative feedback is what occurs most in the body, being considered by many authors the primary mechanism for the maintenance of homeostasis. It causes a negative change from the initial change, that is, a stimulus contrary to the one that led to the imbalance.