
Which is the first part of the small intestine in humans?
a. Duodenum
b. Jejunum
c. Ileum
d. Caecum
Answer
515.4k+ views
2 likes
Hint: The pyloric portion of stomach opens into the small intestine. The opening of the stomach into the small intestine is guarded by a pyloric sphincter.
The small intestine consists of three parts:-
- U Shaped duodenum
- Middle coiled portion jejunum
- Highly coiled portion ileum.
Complete answer:
> Duodenum: The small intestine or small bowel is an organ in the gastrointestinal tract where most of the end absorption the stomach and curves around the pancreas to end in the region of the left upper part of the abdominal cavity. Which is the first part. So, this option is correct.
> Jejunum: The jejunum is the middle segment of the small intestine found between the duodenum and the ileum. The nutrients present in food are mostly absorbed here and then are passed to ileum. So , this option is not correct.
> Ileum: The ileum is the final section of the small intestine in most higher vertebrates, including mammals. So, this option is also not correct.
> Caecum: a pouch connected to the junction of the small and large intestines. So, this option is also not correct.
Hence, The correct answer is option (A).
Note: The most important function of the small intestine is to break down food and help in absorption of nutrients. The villi present in the small intestine increases the surface area for absorption of food. The villi is richly supplied with blood vessels.
Complete digestion takes place in the small intestine. Fats are digested in the small intestine.
Large globules of fat are converted into the small fat globules for enzymes to work efficiently.
Lipase is the enzyme that catalyse the fat breakdown.
The small intestine consists of three parts:-
- U Shaped duodenum
- Middle coiled portion jejunum
- Highly coiled portion ileum.
Complete answer:

> Duodenum: The small intestine or small bowel is an organ in the gastrointestinal tract where most of the end absorption the stomach and curves around the pancreas to end in the region of the left upper part of the abdominal cavity. Which is the first part. So, this option is correct.
> Jejunum: The jejunum is the middle segment of the small intestine found between the duodenum and the ileum. The nutrients present in food are mostly absorbed here and then are passed to ileum. So , this option is not correct.
> Ileum: The ileum is the final section of the small intestine in most higher vertebrates, including mammals. So, this option is also not correct.
> Caecum: a pouch connected to the junction of the small and large intestines. So, this option is also not correct.
Hence, The correct answer is option (A).
Note: The most important function of the small intestine is to break down food and help in absorption of nutrients. The villi present in the small intestine increases the surface area for absorption of food. The villi is richly supplied with blood vessels.
Complete digestion takes place in the small intestine. Fats are digested in the small intestine.
Large globules of fat are converted into the small fat globules for enzymes to work efficiently.
Lipase is the enzyme that catalyse the fat breakdown.
Latest Vedantu courses for you
Grade 11 Science PCM | CBSE | SCHOOL | English
CBSE (2025-26)
School Full course for CBSE students
₹41,848 per year
Recently Updated Pages
Master Class 11 Business Studies: Engaging Questions & Answers for Success

Master Class 11 Economics: Engaging Questions & Answers for Success

Master Class 11 Accountancy: Engaging Questions & Answers for Success

Master Class 11 Computer Science: Engaging Questions & Answers for Success

Master Class 11 English: Engaging Questions & Answers for Success

Master Class 11 Maths: Engaging Questions & Answers for Success

Trending doubts
The flightless birds Rhea Kiwi and Emu respectively class 11 biology CBSE

1 Quintal is equal to a 110 kg b 10 kg c 100kg d 1000 class 11 physics CBSE

A car travels 100 km at a speed of 60 kmh and returns class 11 physics CBSE

What is 1s 2s 2p 3s 3p class 11 chemistry CBSE

In tea plantations and hedge making gardeners trim class 11 biology CBSE

A difference between diffusion and osmosis is a A semipermeable class 11 chemistry CBSE
