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

Options

A. Growth Hormone becomes inactive in adults
B. Epiphyseal plates close after adolescence.
C. Bones loose their sensitivity to Growth Hormones in adults
D. Muscle fibres do not grow in size after birth.

Answer

**Step-by-Step Solution:**

1. **Understanding Growth Hormone (GH):**
- Growth hormone, also known as somatotropin, is a hormone that stimulates growth, cell reproduction, and cell regeneration in humans and other animals. It plays a crucial role in physical growth during childhood and adolescence.

2. **Role of Epiphyseal Plates:**
- In long bones, growth occurs at the epiphyseal plates, which are regions of cartilage located at the ends of the bones. These plates allow for the lengthening of bones during growth periods.

3. **Closure of Epiphyseal Plates:**
- During adolescence, the epiphyseal plates gradually ossify (turn into bone) and close. This closure signifies the end of bone lengthening and typically occurs after puberty.

4. **Hypersecretion of Growth Hormone in Adults:**
- In adults, hypersecretion of growth hormone can lead to conditions such as acromegaly, where there is an increase in bone density and soft tissue growth, but not an increase in height. This is because the epiphyseal plates are already closed.

5. **Conclusion:**
- Therefore, the hypersecretion of growth hormone in adults does not lead to further increases in height due to the closure of the epiphyseal plates, which prevents any further elongation of the bones.

**Final Answer:**
Hypersecretion of Growth Hormone in adults does not cause further increase in height because the epiphyseal plates are closed after adolescence, preventing any further elongation of bones.

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