The 𝐀𝐏𝐏𝐄𝐍𝐃𝐈𝐗 is a thin tube that is bound to the large intestine. It sits in the lower right part of the belly or abdomen. At a young change of a person, the appendix works as a part of the immune system, helping the body to fight disease.

The appendix is composed of the four layers characteristic of the gastrointestinal tract: mucosa, submucosa, muscularis external, and serosa.

The 𝐆𝐀𝐋𝐋 𝐁𝐋𝐀𝐃𝐃𝐄𝐑 is a small pouch that sits just under the liver. It stores bile between meals. When we eat, this organ squeezes bile through the bile ducts into the small intestine.

The wall of the gall bladder is composed of the following layers: mucosa (simple columnar epithelium & lamina propria) tunica muscularis, and an outer layer of connective tissue (adventitia & serosa).

The 𝐋𝐀𝐑𝐆𝐄 𝐈𝐍𝐓𝐄𝐒𝐓𝐈𝐍𝐄 (also known as the colon or large bowel, is responsible for the reabsorption of fluids and electrolytes and elimination of undigested food.

It is composed of the four layers characteristic of the gastrointestinal tract: mucosa (or mucous membrane), submucosa, and muscularis external.

REFERENCES:
Histology Guide (n.d.). Chapter 14 – Gastrointestinal Tract. Retrieved from https://histologyguide.com/slidebox/14-gastrointestinal-tract.html

John Hopkins Medicine (n.d.). Appendicitis. Retrieved from https://www.hopkinsmedicine.org/health/conditions-and-diseases/appendicitis#:~:text=The%20appendix%20is%20a%20thin,your%20body%20to%20fight%20disease.

NIH (n.d.). Your Digestive System & How it Works. Retrieved from https://www.niddk.nih.gov/health-information/digestive-diseases/digestive-system-how-it-works