Question

Water from the undigested food is absorbed mainly in the
A. Stomach
B. Food pipe
C. Small intestine
D. Large intestine

Answer 1

Hint: Human digestive system is a complex system comprising various organs and glands. The digestion of food is an enzyme-based reaction by which a complex form of food that we eat is converted into the simplest form.

Complete Answer:
- In this particular question, we have to study that the water from the undigested food is absorbed mainly only in the large intestine or large bowel. The large intestine is the lowermost part of the gastrointestinal tract or digestive system.
- Our digestive system is playing a vital role in the digestion and absorption of food. The digestive system is composed of numerous organs that possess specific functions in the coordination of each other.
- Food that we eat is in a complex form that is not directly absorbed into the blood so that the digestive system breaks them down into smaller forms which are easily absorbed by our blood vessels and absorbed into the bloodstream.
- Generally, our digestive system performs via six main steps that are i) ingestion, ii) secretion, iii) motility, iv) digestion, v) absorption, and vi) defecation. Some glands are present in our body that are associated with the digestive system; those glands are the salivary gland, pancreas, liver, and gallbladder.
- Among all of the organs, the small intestine and large intestine are the most important organs of the digestive system. The small intestine can absorb about 90% of nutrients and water. It is a site where absorption of sugars, amino acids, peptides, vitamins, and ions (calcium, potassium, chloride, sodium). The large intestine absorbs most of the electrolytes and fluids from the digested food.
- When the chyme is passing through the ileocecal valve into the large intestine most of the electrolytes in this chyme are absorbed in the colon (absorbing colon). A distal colon is principally for the storage of feces and therefore it is called a storage colon. The large intestine has the potential to absorb 5-8 liter of fluid or water each day.

So, the correct answer to this question is option D ‘Large intestine’.

Note: Large intestine is playing a key role in our digestive system; it can absorb most of the water from undigested food. There are three main types of movement that occur in the large intestine that are haustral churning, peristalsis, and mass peristalsis.