</p><p>Which is the longest organ of digestive system in human body?</p> <p></p>

One of the reasons why some people cough after eating a meal may be due to the improper movement of ?

Nyctalopia can occur due to the deficiency of ?

In man cellulose is digested in ?

HCl is secreted by ?

The process of getting rid of wastes by organisms is known as _____ .</p>

In pancreas, pancreatic juice and hormones are secreted by ?

Digestion of protein is necessary due to ?