Autonomic centers in the ________ exert neural control over hormone secretion by the adrenal medullae. a) pineal gland b) pituit

The proper answer is option-E. The activity of the autonomic nervous system (ANS) is primarily regulated by the hypothalamus. This organ's autonomic centers govern the secretion of hormones from the adrenal medulla, such as adrenaline and norepinephrine. Moreover, the hypothalamus also influences the vasomotor center, which is essential for regulating blood pressure. Thus, the correct option is hypothalamus.