Describe the movement in small and large intestine

Answer 1

The movement in the small and large intestine is primarily governed by two types of movements known as peristalsis and segmentation.

Peristalsis is a rhythmic contraction and relaxation of the smooth muscles that propels the contents along the digestive tract. In the small intestine, peristaltic waves sequentially contract and relax segments of the smooth muscles, pushing the chyme (partially digested food) forward. This movement helps mix the chyme with digestive enzymes and absorb nutrients.

Segmentation, on the other hand, involves the contraction and relaxation of smaller sections of the intestinal wall simultaneously, which serves to mix the chyme more effectively. This movement also ensures that the chyme comes into close contact with the absorptive surfaces of the small intestine, facilitating nutrient absorption.

In both the small and large intestine, the movement is regulated by the enteric nervous system, which is a complex network of nerves located within the gut wall. These nerves coordinate the contractions of the smooth muscles, ensuring an organized and efficient movement of the intestinal contents.

Additionally, the large intestine has a slower movement compared to the small intestine. This slow movement allows for further absorption of water and electrolytes from the chyme, consolidating the waste into feces. The slow contractions in the large intestine, known as haustral contractions, move the chyme back and forth, promoting water reabsorption and compaction of the feces.

Overall, the movement in the small and large intestine is crucial for digestion, absorption of nutrients, and elimination of waste. These coordinated muscle contractions ensure the effective processing of food as it progresses through the digestive system.