Before reaching intestine, the larva of Ancylostoma travels through

Options

A. Lungs and trachea
B. Oesophagus
C. Heart
D. All the above

Answer

To answer the question about the journey of the larva of Ancylostoma before it reaches the intestine, we can break it down into several steps:

### Step-by-Step Solution:

1. **Understanding Ancylostoma**:
- Ancylostoma is a genus of parasitic nematodes, commonly known as hookworms. The larval form of Ancylostoma is referred to as "Pilariform."

2. **Entry into the Host**:
- The larva of Ancylostoma typically penetrates the skin of the host, usually through the feet. This is the first step in its life cycle.

3. **Migration through the Body**:
- After entering the body, the larva travels through the bloodstream to the lungs. This is the second step in its journey.

4. **Travel through the Trachea**:
- From the lungs, the larva moves into the trachea. This is the third step in its migration.

5. **Swallowing and Passage through the Esophagus**:
- The larva is then swallowed and passes through the esophagus. This is the fourth step.

6. **Reaching the Heart**:
- While the larva does not mature in the heart, it can pass through this organ during its journey. This is an important part of its migration.

7. **Final Destination - Small Intestine**:
- Ultimately, the larva reaches the small intestine, where it matures into an adult worm and begins to reproduce, causing disease in the host.

8. **Conclusion**:
- Therefore, the correct answer to the question is that the larva of Ancylostoma travels through the lungs, trachea, esophagus, and heart before reaching the intestine. Thus, the answer is "all of the above."

### Final Answer:
The larva of Ancylostoma travels through the lungs, trachea, esophagus, and heart before reaching the intestine.

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