26. What happens to theTSH
(thyroid-stimulating hormone)
blood level in hypothyroidism?
Why is there enlargement of
the thyroidin the endemic
goiter disease?

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When there is low and T4 secretion
by thyroid the TSH secretion the
hypophysis is very and the
TSH blood increases. The increase
in TSH availability promotes the
of the thyroid gland.
thyroid enlargement is a of
a tissue that to compensate the
functional by making the
gland its size.