In the remainder of this section we
describe some of the best understood
and most important of vertebrate hormones.
While the following discussion
is limited principally to a brief
overview of mammalian hormonal
mechanisms (since laboratory mammals
and humans have always been
the objects of the most intensive research),
we will point out some important
differences in functional roles of
hormones among different vertebrate
Figure 36-6 Relationship of hypothalamic, pituitary,
target-gland hormones. The hormone sequence
the release of cortisol from the
adrenal cortex is used as an example.