What is the main role of the large intestine?
A. Absorb nutrients
B. Digest proteins
C. Absorb water and form feces
D. Produce insulin
Answer (1)
The correct answer is C. Absorb water and form feces. The large intestine, also known as the colon, is the final section of the digestive system. Its primary role is to absorb water and electrolytes from the remaining undigested food and to form solid waste (feces) for excretion. This process is essential for maintaining fluid balance and preventing dehydration.After the nutrients are absorbed in the small intestine, the leftover material (mostly fiber, bacteria, and water) passes into the large intestine. The colon absorbs the remaining water, making the material more solid as it moves through.The large intestine is divided into several parts:Cecum – the starting point of the colon.Ascending, transverse, descending, and sigmoid colon – pathways through which waste travels.Rectum and anus – where feces are stored and eventually expelled.Another important function of the large intestine is the housing of gut bacteria (microbiota) that help:Break down fiber.Synthesize certain vitamins like vitamin K and B vitamins.Support the immune system.Problems in the large intestine can cause conditions like constipation, diarrhea, colorectal cancer, or inflammatory bowel disease (IBD).
