Hyperthyroidism is excessive secretion of thyroid hormones. This can happen due to

Excess secretion of thyroid hormones by the thyroid gland

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Excess secretion of TSH from the pituitary gland

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Excess secretion of TSH-RH from the hypothalamus

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All the above

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Solution

The correct option is D
All the above

Thyroid hormone is secreted by thyroid gland under the influence of Thyroid Secreting Hormone (TSH). TSH is produced by the pituitary, which in turn, is secreted under the influence of TSH-releasing hormone (TSH-RH) from the hypothalamus. Therefore, excess secretion of any of these can cause hyperthyroidism.

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\begin{matrix} Column 1 & Column 2 A. Melatonin & i. Swelling of the thyroid gland B. Cretinism & ii.Increased rate of synthesis and secretion of the thyroid hormones C. Hyperthyroidism & iii. Defective development and maturation of the growing baby leading to stunted growth D. Goitre & iv. Regulates the diurnal rhythm of the body \end{matrix}

Dwarfism results due to :

(a) excessive secretion of thyroxine hormone

(b) excessive secretion of growth hormone

(d) less secretion of growth hormone

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