Hypersecretion of Growth Hormone in adults does not cause further increase in height, because
Answer: (B) Epiphyseal plates close after adolescence. Answer: (b) Epiphyseal plates close after adolescence Solution: Linear (height) growth requires open epiphyseal plates where long bones elongate.
- A.Growth Hormone becomes inactive in adults
- B.Epiphyseal plates close after adolescence✓
- C.Bones loose their sensitivity to Growth Hormone in adults
- D.Muscle fibres do not grow in size after birth
Correct Answer
(B) Epiphyseal plates close after adolescence
Solution & Explanation
Answer: (b) Epiphyseal plates close after adolescence Solution: Linear (height) growth requires open epiphyseal plates where long bones elongate. After adolescence these plates fuse/close, so even excess growth hormone in adults cannot increase height; instead it causes severe disfigurement (especially of the face) called Acromegaly. GH remains active in adults, so the basis is the closure of epiphyseal plates. NCERT Reference: Chapter 19, Page 241, Line(s) 31-33 — "Excess secretion of growth hormone in adults especially in middle age can result in severe disfigurement (especially of the face) called Acromegaly, which may lead to serious complications"