How long is a rat's large intestine and small intestine in cm? and why is one bigger than the other?

Answer;

The large intestine is much wider than the small intestine, but it is also much shorter. The small intestine is the longest part of the digestive system.

Explanation;

The small intestine is a muscular tube with three parts; the duodenum breaks down the food, the jejunum and the ileum absorb nutrients and send them into the bloodstream.

The reason why the small intestine is longer than the large intestine and any other part of the digestive system is to ensure maximum and complete absorption of nutrients to the blood stream.

The main function of large intestine is to absorb water from the digested food in order to form stool of sufficient consistency therefore its surface area needs to be large and hence it is longer than the small intestine.  

Explanation:

The length of small intestine of rat is 80 centimeters and the length of large intestine is 113 centimeters

Small intestine lies between the stomach and the large intestine while the large intestine starts from the point where the small intestine ends and continues till the anus.

The main function of large intestine is to absorb water from the digested food in order to form stool of sufficient consistency therefore its surface area needs to be large and hence it is longer than the small intestine.