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Hypersecretion of Growth Hormone in adults does not cause further increase in height, because:

1. (a) Epiphyseal plates close after adolescence.
2. (b) Bones loose their sensitivity to Growth Hormone in adults.
3. (c) Muscle fibres do not grow in size after birth.
4. (d) Growth Hormone becomes inactive in adults.

Correct answer: (a) Epiphyseal plates close after adolescence.

Solution

In adults, the epiphyseal (growth) plates have already fused, so long bones can no longer lengthen. Therefore, excess growth hormone cannot increase height, though it may cause other changes like acromegaly.

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