Hypersecretion of growth hormone in adults does not cause further increase in height, because

  1. A) bones lose their sensitivity to growth hormone in adults
  2. B) epiphyseal plates close after adolescence
  3. C) growth hormone becomes inactive in adults
  4. D) muscle fibres do not grow in size after birth

Answer:B) epiphyseal plates close after adolescence

Explanation: Epiphyseal plates are present at the end of long bones. It is a hyaline cartilage plate, where new bone growth takes place. It is also known as a growth plate. It is present in children and adolescents and gets replaced by the epiphyseal line in adults. This transformation is termed epiphyseal closure or growth plate fusion. In adults, hypersecretion of GH causes Acromegaly, which is characterised by severe disfigurement.

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