15. What is the relation
between the thyroid and the
hypophysis?

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The hypophysis secretes TSH,
stimulating hormone.
This hormone the
secretion of thyroid
(triiodothyronine and
thyroxine, or and T4).
When the concentration of
thyroid hormones high this
information isdetected the
hypothalamus and by hypophysis
and this gland the TSH
secretion. When thyroid hormone
levels are the TSH secretion
increases. is thus a negative
.

Injuries of the hypophysis cause
TSH hyposecretion (for , in case
of tissue ) or hypersecretion
(in case, ,g., of excessive cell
proliferation cancer) can change the
of the thyroid gland
.