Q. Which statement is correct about the thyroid gland?
A) 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
Explanation
Lack of TH in foetal and early neonatal life leads to a condition called cretinism in which there is a mental retardation. Thyroid hormones inhibit the 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.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.