First slide

Human Endocrine System

Question

One does not grow in height after becoming an adult because

Moderate

A

the growth hormone secretion is inhibited.
B

muscle fibres do not grow once after the birth.
C

epiphyseal plates of bones close after teenage.
D

bones become immune to growth hormone.

Solution

Epiphyseal plate is a hyaline cartilage plate in the metaphysis at each end of long bone. It is part of long bone where new bone growth takes place. In adults, elevated levels of GH results in acromegaly where no increase in height occurs because of ossified epiphyseal plate.
Growth hormone only thickens the bones but does not lengthen them.

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