Question

What happens to the food that remains undigested?

Answer 1

Hint: It will move to that region of the stomach where further digestion and excretion occur and different juices and enzymes will be released.

Complete answer:
The food is digested mostly in the stomach and small intestine by the secretion of various digestive juices and enzymes. The digestive juices and enzymes are secreted from various organs in the stomach like the pancreas, liver, and small intestine. In the small intestine, a finger-like projection is found which is known as villi. Villi increases the surface area for absorption and absorbs nutrients from the stomach region.
Most of the food is digested in the stomach and small intestine but the remaining undigested food material is then transferred to the large intestine. In the large intestine, the water is absorbed and the remaining undigested food is stored in its lower region called the rectum. Its undigested food is then converted into the semi-solid mass which is stored in the rectum.
From the rectum, the food is then transferred to the urinary bladder, from there to the urethra, and finally excreted out of the body through the anus region. If the complete absorption of food does not take place then it may result in various issues like weight reduction, smelling stools, and looseness of the bowels.

Note: Digestion is the process of breaking large food materials into water-soluble small food molecules. These substances are absorbed in the small intestine from there to the bloodstream as is supplied to all body parts. The human digestion was first studied and observed by William Beaumont of Lebanon.