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Question:

Hypersecretion of Growth Hormone in adults does not cause further increase in height or weight because:
Muscle fibres do not grow in size after birth.
Growth Hormone becomes inactive in adults.
Epiphyseal plates close after adolescence.
Bones lose their sensitivity to Growth Hormone in adults.

Growth Hormone becomes inactive in adults.

Epiphyseal plates close after adolescence.

Bones lose their sensitivity to Growth Hormone in adults.

Muscle fibres do not grow in size after birth.

Solution:

Epiphyseal plates are composed of hyaline cartilage. These are present at the end of the long bones. The bones stop growing in early adulthood, due to the closure of epiphyseal plates.So, the correct answer is option C.