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During its journey through the body, the...

During its journey through the body, the juvenile Ascaris passes throhgh

A

Spleen

B

Kidney

C

Skeleton muscles

D

Lung

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the journey of juvenile Ascaris through the body, we can break down the life cycle and the path it takes step by step. ### Step-by-Step Solution: 1. **Understanding Ascaris**: - Ascaris lumbricoides is a parasitic roundworm that infects humans. It is important to know that the juvenile stage of Ascaris is what we are focusing on in this question. 2. **Infection Process**: - Humans acquire Ascaris infection by ingesting eggs that are present in contaminated food or water. This is the starting point of the Ascaris life cycle. 3. **Hatching and Initial Development**: - Once ingested, the eggs hatch in the intestine, releasing the juvenile (larval) form of Ascaris. 4. **Penetration into the Bloodstream**: - The juvenile Ascaris larva penetrates the intestinal wall and enters the bloodstream. This is a crucial step as it allows the larva to travel to different parts of the body. 5. **Travel to the Liver and Heart**: - After entering the bloodstream, the larva is carried through the hepatic portal circulation to the liver and then to the heart. 6. **Journey to the Lungs**: - From the heart, the larva is transported to the lungs via the pulmonary artery. This is where the juvenile Ascaris spends a significant amount of time. 7. **Development in the Lungs**: - In the lungs, the larva undergoes several molts, transforming from the second larva to the third larva, and eventually to the fourth larva. This stage is important for its growth and development. 8. **Ascending the Respiratory Tract**: - The larva then ascends the bronchial tree, reaches the throat, and is eventually swallowed to return to the intestine. 9. **Maturation into Adult Form**: - Once back in the intestine, the larva matures into an adult Ascaris, completing its life cycle. ### Conclusion: - The correct answer to the question is that during its journey through the body, the juvenile Ascaris passes through the **lungs**. ---
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