Ileum- Located at the last part and the longest in the small intestine which connects to the first part of the large intestine called the cecum. The Ileum helps digest further food that comes from the stomach. It is responsible for the absorption of Vitamin B12 which is important in the formation of red blood cells and DNA. It also reabsorbs conjugated bile salts.

Stomach- The stomach is located at the left upper quadrant of the body. It receives food from the esophagus. Then it secretes acids and enzymes that turns food into smaller bits. The contraction of the stomach muscles called churning enhances the digestion of food.

Appendix- Located at the right lower quadrant or at the lower abdomen. One of the controversially talked part of the large intestine is the appendix. There is still no concrete explanation for its function but other medical experts theorized that it could be a storehouse of good bacteria and restarts the digestive system after a diarrheal incident.

Large intestine- Also called the large bowel, is located at the lower abdominal cavity below the waist surrounding the small intestine. It absorbs water and electrolytes. It is also where feces are made from the remains of food and fluids and other by products that is stored and pushed towards the rectum and anus to be excreted out of the body.

Note: I used two microscopic pictures for the Ileum.