The neuroendocrine control of food intake and of thyroid function
involve neurotransmitters / neuropeptides as inputs and outputs to an
integrator located in the PVN (Paraventricular Nucleus).  From a
conceptual view of nerve cell connectivity and function, describe and
compare a possible circuitry consisting of neuronal and endocrine
signals (to and from the PVN integrator) operating during the
following two opposite metabolic and thermogenic conditions

a) feeding / satiety (hypermetabolic condition)

b) fasting / starvation (hypometabolic condition)