Question

Cretinism and myxoedema are due to

• A. Hypersecretion of thyroxine
• B. Hypersecretion of growth hormone
• C. Hyposecretion of thyroxine
• D. Hyposecretion of growth hormone

Answer 1

The correct option is C

Hyposecretion of thyroxine

The correct option is C:

Explanation of the correct option:

1. Cretinism and myxoedema are caused by the insufficient or low production of thyroxine.
2. Hypothyroidism impairs the development of the growing fetus, resulting in mental retardation and limited growth.
3. Myxoedema is caused by thyroid hormone deficiency. It is distinguished by swelling and thickness of the skin, particularly in the lower legs.
4. Insufficient or low production of thyroxine is called hypothyroidism.

Explanation of the incorrect options:

Option A:

Hypersecretion of goiter causes exophthalmic goiter.

Option B:

Hypersecretion of growth hormone causes gigantism.

Option D:

Hyposecretion of growth hormone causes dwarfism.

Final answer: Cretinism and myxoedema are due to hyposecretion of thyroxine.