Duodenum, Jejunum, ileum are _________ parts.(A) small Intestine (B) Large Intestine(C) Oesophagus (D) Stomach

The correct answer is (A) small Intestine.

Explanation

The duodenum, jejunum, and ileum are three distinct sections that make up the small intestine, which is a crucial component of the digestive system. The small intestine is where most of the digestion and absorption of nutrients occur.

1. Duodenum: This is the first part of the small intestine, directly connected to the stomach. It is responsible for the first phase of digestion, where food is mixed with bile from the liver and pancreatic juices to further break down food.

2. Jejunum: Following the duodenum, the jejunum is the middle section of the small intestine. Here, the majority of nutrient absorption occurs. The jejunum has a greater surface area due to its folds and villi, which are tiny projections that help in absorbing nutrients into the bloodstream.

3. Ileum: This is the final part of the small intestine, connecting to the large intestine. The ileum continues the absorption process, particularly of vitamin B12 and bile acids, which are recycled back to the liver.

This division is significant as each section has specialized functions that assist in the overall digestive process, and together they comprise the small intestine.