Question

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

• 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

Answer 1

The correct option is B epiphyseal plates close after adolescence

Growth Hormone (GH) is produced by the anterior pituitary. Over-secretion of GH stimulates abnormal growth of the body (gigantism) and low secretion of GH results in stunted growth (dwarfism).
In adults, hypersecretion of GH does not cause further increase in height because epiphyseal plates close after adolescence. Epiphyseal plate is a hyaline cartilage plate at each end of a long bone where new bone growth takes place.