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STD 11 - 19. Chemical coordination and integration — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 19. Chemical coordination and integration1 Mark
MCQ
Which statement is correct about the thyroid gland?
  • ✓
    Thyroid hormones are essential for the early development and maturation of the central nervous system
  • B
    $T3 \;and \;T4$ stimulate the secretion of $TSH$ by the anterior pituitary
  • C
    People who have an over active thyroid gland have a low $BMR$
  • D
    Low plasma levels of thyroid hormones leads to thyrotoxicosis
✓

Answer

Correct option: A.
Thyroid hormones are essential for the early development and maturation of the central nervous system
a
Lack of $TH$ in foetal and early neonatal life leads to a condition called cretinism in which there is a mental retardation. Thyroid hormones inhibitthe secretion of $TSH$ by negative feedback. Thyroid hormones stimulate metabolism, so when $TH$ levels are high, $BMR$ is elevated. Thyrotoxicosis is caused by an overactive thyroid gland. Low levels of thyroid hormones cause myxoedema.

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