Which is the vestigeal organ in man

Options

A. Vermiform appendix
B. Cervical vertebra
C. Atlas
D. None of the above

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Vestigial Organs**: Vestigial organs are structures that were once functional in our ancestors but have lost most or all of their original function through the course of evolution.

2. **Identifying Vestigial Organs in Humans**: In humans, several organs are considered vestigial. Notably, the vermiform appendix is often cited as the most recognized vestigial organ.

3. **Function of the Vermiform Appendix**: The vermiform appendix is believed to have been useful for our herbivorous ancestors, aiding in the digestion of cellulose from plant material. It housed bacteria that helped break down tough plant fibers.

4. **Current Relevance of the Appendix**: In modern humans, the appendix does not play a significant role in digestion, especially since our diets have changed to include cooked foods that do not require such digestive assistance. If the appendix is removed, it does not typically result in any noticeable health issues, further indicating its vestigial nature.

5. **Other Organs Considered**: Other options mentioned, such as cervical vertebrae and the atlas, are essential for supporting the head and protecting the spinal cord. Therefore, they are not considered vestigial.

6. **Conclusion**: Based on the above analysis, the correct answer to the question about the vestigial organ in humans is the **vermiform appendix**.

**Final Answer**: The vestigial organ in man is the **vermiform appendix**.

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