If there is insufficient iodine in the diet, a low amount of thyroxine is synthesized. This causes

BIOLOGY FREAK

wrote...

13 years ago

If there is insufficient iodine in the diet, a low amount of thyroxine is synthesized. This causes

if there is insufficient iodine in the diet, a low amount of thyroxine is synthesized. This causes
A. a negative feedback to the pituitary to produce more TSh
b. a condition in adults called hypothyroidism in which they are extremely active and cannot gain weight
C. the development of diabetes insipidus in young children
D. under stimulation of the thyroid resulting in the formation of a goitre..

thnx.

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bio_man

wrote...

Educator

13 years ago

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BIOLOGY F. Author

wrote...

13 years ago

see i hate this question.. it makes no sense.. it can't be D.. because it says in my textbook that the RELENTLESS stimulation of the thyroid gland causes a goitre... it's so confusing.. A is the only one that makes sense.. but the negative feedback part in front of it doesn't.

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bio_man

wrote...

Educator

13 years ago

Worldwide, the most common cause for goitre is iodine deficiency. The question explicitly states insufficient iodine in the diet so I'm sticking with D Slight Smile

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BIOLOGY F. Author

wrote...

13 years ago

but it can't be because of under-stimulation...

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bio_man

wrote...

Educator

13 years ago

My apologies, you are right!

If thyroid function is low, the message is sent to the pituitary to produce more TSH to stimulate the production of thyroid hormone.

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BIOLOGY F. Author

wrote...

13 years ago

but the thing is.. how is that negative feedback... negative feedback is= the more thyroxine produced, the less TSH.. but here.. how is this negative feedback?

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bio_man

wrote...

Educator

13 years ago

Read up on this: http://tinyurl.com/29b69hb

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