Undersecretion of thyroxine results in:
Correct answer: C. Hypothyroidism
- A. Grave's disease
- B. Hyperthyroidism
- C. Hypothyroidism
- D. Goitre
Explanation
Undersecretion of thyroxine leads to hypothyroidism, which causes a variety of symptoms such as fatigue, weight gain, and cold intolerance, due to the decreased production of thyroid hormones that regulate metabolism. Grave's disease and hyperthyroidism are associated with excessive hormone production, not undersecretion. Goitre can result from both low and high levels of thyroxine, often related to iodine deficiency or autoimmune conditions, and is not solely indicative of undersecretion.
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About Chemical Coordination and Hormones
Chemical coordination uses hormones released by endocrine glands and carried in blood to specific target cells. Coverage includes the pituitary, thyroid, pancreas, adrenal glands, ovaries and testes, feedback control, and the contrast between slower, longer-lasting hormonal responses and rapid nervous coordination.
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