In adult human beings , growth and cell division stop in

Options

A. Skin cells
B. Bone marrow
C. Testes and ovary
D. Bone cells.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks where growth and cell division stop in adult human beings. We need to identify the tissues or cells that cease to divide after reaching adulthood.

2. **Identifying the Options**: The options provided in the question include skin cells, bone marrow, testes, ovaries, and bone cells. We need to analyze each of these to determine where cell division stops.

3. **Analyzing Skin Cells**: Skin cells are known to continuously divide and regenerate throughout a person's life. Therefore, growth and cell division do not stop in skin cells.

4. **Analyzing Bone Marrow**: Bone marrow is responsible for producing blood cells, including red blood cells, white blood cells, and platelets. These cells are continuously produced, indicating that growth and cell division do not stop in bone marrow.

5. **Analyzing Testes and Ovaries**: The testes and ovaries are involved in the production of gametes (sperm and eggs, respectively). While the rate of gamete production may change, these organs continue to undergo cell division throughout adulthood.

6. **Analyzing Bone Cells**: Bone cells, specifically osteoblasts, osteoclasts, and osteocytes, are involved in the remodeling of bone tissue. However, the overall growth and division of bone cells slow down significantly in adulthood, and they do not divide as actively as other cell types.

7. **Conclusion**: Based on the analysis, the correct answer is that growth and cell division primarily stop in bone cells in adult human beings.

**Final Answer**: In adult human beings, growth and cell division stop in bone cells.

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