Chemical Coordination and Integration

Question

Goitre can occur as a consequence of all the following except

  • iodine deficiency

  • pituitary adenoma

  • Grave's disease

  • excessive intake of exogenous thyroxin

Answer

D.

excessive intake of exogenous thyroxin

Thyroxine is the main hormone secreted into the bloodstream by the thyroid gland. It is the inactive form and most of it is converted to an active form called triiodothyronine by organs such as the liver and kidneys.

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