Ascaris normally inhabits the lumen of
A. Stomach
B. Small intestine
C. Appendix
D. Large intestine
B. Small intestine
Ascaris normally inhabits the lumen of the small intestine.
To determine the correct answer, we need to understand the habitat of Ascaris. Ascaris is a type of roundworm that commonly infects humans. These worms primarily inhabit the human digestive system.
To further pinpoint the specific part of the digestive system where Ascaris normally resides, we can eliminate options that are not part of the digestive tract. From the given choices, we can exclude the stomach as it is located higher up in the digestive system and is not a common habitat for Ascaris.
Next, we can eliminate the appendix as it is a small organ connected to the large intestine and not a site where Ascaris typically infests.
This leaves us with two remaining options: the small intestine and the large intestine. In order to determine the correct answer between the two, it is important to know that Ascaris infection typically begins in the small intestine, where the worms hatch from their eggs and mature. From there, they can further migrate to other parts of the digestive system. However, the primary or main habitat of Ascaris is the small intestine.
Therefore, the correct answer is:
B. Small intestine