––STOMACH––

The stomach is a J-shaped organ that digests food and is part of the gastrointestinal (GI) tract. It produces enzymes and digestive juices to break down food, which is then sent to the small intestine for further digestion and nutrient absorption. The stomach’s functions include temporarily storing food, mixing and breaking down food through contractions, and producing enzymes and specialized cells for digestion. The stomach is located in the upper left side of the abdomen and varies in size depending on how much it holds. It is composed of five sections: the cardia, fundus, body (corpus), antrum, and pylorus, each with specific roles in the digestion process. The stomach’s structure includes layers of muscle and other tissues such as the mucosa, submucosa, muscularis externa, and serosa that support its functions in digestion (Cleveland Clinic, 2021).

––JEJUNUM––

The jejunum is one of the three sections of the small intestine, located between the duodenum and the ileum. It is a vital part of the digestive system, responsible for breaking down and absorbing nutrients such as sugars, fatty acids, and amino acids. The jejunum makes up about two-fifths of the small intestine and is known for its vigorous and quick peristalsis, which helps move nutrients through the digestive system. Its red color is due to the large number of blood vessels supplying it, and it is supported by the mesentery. The jejunum’s lining contains features such as circular folds, villi, and microvilli, which increase the surface area for efficient nutrient absorption. The enzymes on the microvilli further digest sugars and amino acids for absorption into the bloodstream (Seladi-Schulman, 2021).

––CAECUM––

The cecum is a pouch or large tubelike structure in the lower abdominal cavity that marks the beginning of the large intestine. It receives undigested food material from the small intestine and is separated from the ileum by the ileocecal valve, which regulates food passage and prevents backflow. The cecum’s main functions are to absorb fluids and salts remaining after digestion and absorption in the small intestine and to mix contents with mucus for lubrication. Its internal wall comprises a thick mucous membrane that absorbs water and salts, supported by a layer of muscle tissue that churns the contents. Variations in cecum size and structure occur among different animal species, with some animals having an enlarged cecum for plant digestion or multiple ceca, while others, like certain insectivores, lack a cecum entirely (Britannica, 2024).

––TONGUE––

The tongue is a muscular organ in the mouth that aids in chewing, swallowing, speaking, and breathing. It moves food around to help with digestion and helps form words for clear speech. The tongue also helps keep the airway open for proper breathing. It runs from the hyoid bone in the middle of the neck to the floor of the mouth and is made mostly of muscle covered in mucosa, with different types of papillae (bumps) and taste buds. These papillae include filiform, fungiform, circumvallate, and foliate, which help with taste detection. The five basic tastes are sweet, salty, bitter, sour, and umami, and taste buds can detect all five flavors. A healthy tongue is typically pink, though the shade can vary (Cleveland Clinic, 2022).

––ESOPHAGUS-STOMACH––

The esophagus is a hollow, muscular tube that transports food and liquid from the throat to the stomach as part of the digestive system. Its primary function is to carry food and liquid from the mouth to the stomach, and it works through coordinated muscular contractions called peristalsis. The esophagus has two ring-shaped muscles at its openings: the upper esophageal sphincter at the top and the lower esophageal sphincter (LES) at the bottom. These sphincters open to let food pass and remain closed otherwise to prevent stomach acid from entering the esophagus. Located in the center of the chest behind the windpipe, the esophagus is about 10 to 13 inches long and three-fourths of an inch thick at its smallest point (Cleveland Clinic, 2021).

The stomach is a J-shaped organ within the gastrointestinal (GI) tract that aids in digesting food. It generates enzymes and digestive juices to break down food before sending it to the small intestine for further digestion and nutrient absorption. The stomach’s key functions include temporarily storing food, mixing and breaking it down through contractions, and producing enzymes and specialized cells for digestion. Located in the upper left side of the abdomen, the stomach size changes based on how much food it holds. It consists of five parts: the cardia, fundus, body (corpus), antrum, and pylorus, each with distinct roles in the digestion process. Its structure includes layers such as the mucosa, submucosa, muscularis externa, and serosa, which support its digestive functions (Cleveland Clinic, 2021).

––APPENDIX––

The appendix is a vestigial tube attached to the cecum, the start of the large intestine. Its precise function in humans is unclear, but it may house beneficial gut flora, produce endocrine cells in fetuses, and play a role in immune function in early life. The appendix is thought to be disappearing over evolutionary time, and blockage can lead to appendicitis, a potentially serious inflammation. The appendix is typically 8 to 10 cm long and less than 1.3 cm wide, with muscular walls capable of expelling contents into the cecum. If obstructed, the appendix can swell and distend, causing tissue death and possibly bursting, leading to infection and peritonitis. The body’s protective mechanisms often prevent these complications by sealing off the appendix (Britannica, 2024).

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REFERENCES:

—–Britannica. (2024, March 23). Appendix. Encyclopedia Britannica. https://www.britannica.com/science/appendix

—–Britannica. (2024, March 19). Cecum. Encyclopedia Britannica. https://www.britannica.com/science/cecum

—–Cleveland Clinic. (2021, August 4). Esophagus. https://my.clevelandclinic.org/health/body/21728-esophagus

—–Cleveland Clinic. (2021, September 10). Stomach. https://my.clevelandclinic.org/health/body/21758-stomach

—–Cleveland Clinic. (2022, April 25). Tongue. https://my.clevelandclinic.org/health/body/22845-tongue

—–Seladi-Schulman, J. (2021, November 11). Jejunum overview. Healthline. https://www.healthline.com/human-body-maps/jejunum