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Anatomy Encyclopedia Entry 1778665744

** The **Spleen** is a vital organ in the human body responsible for filtering the blood, storing red blood cells, and playing a key role in the immune system. **CONTENT:** ### Overview The **Spleen** is a soft, oval-shaped organ located in the upper left region of the abdomen, just below the diaphragm. It is a vital part of the lymphatic system, which helps to protect the body against infection and disease. The **Spleen** is approximately 5 inches (13 cm) long and weighs around 6 ounces (170 grams) in adults. Its primary function is to filter the blood, removing old, damaged red blood cells and recycling the iron from them. The **Spleen** also stores red blood cells, platelets, and white blood cells, and helps to activate the immune system by filtering out pathogens and other foreign substances. The **Spleen** has a rich blood supply, with two main arteries that bring oxygenated blood to the organ and two main veins that remove deoxygenated blood. The **Spleen** is also connected to the stomach and small intestine through the splenic artery and vein, which allows it to receive nutrients and waste products from the digestive system. In addition to its filtering and storage functions, the **Spleen** also plays a role in the production of antibodies, which are proteins that help to fight off infections. ### History/Background The **Spleen** has been known to humans for thousands of years, with ancient civilizations such as the Egyptians and Greeks recognizing its importance in the body. The Greek physician Hippocrates (460-370 BCE) wrote extensively about the **Spleen**, describing its role in filtering the blood and storing red blood cells. In the Middle Ages, the **Spleen** was believed to be a seat of emotions, with the concept of "spleen" being used to describe a range of mental and physical symptoms. It wasn't until the 17th century that the **Spleen** was recognized as a separate organ, distinct from the liver and other abdominal organs. ### Key Information The **Spleen** is a vital organ that plays a key role in the immune system. Some of its key functions include: - **Filtering the blood**: The **Spleen** removes old, damaged red blood cells from the blood and recycles the iron from them. - **Storing red blood cells**: The **Spleen** stores red blood cells, platelets, and white blood cells, which are released into the bloodstream as needed. - **Activating the immune system**: The **Spleen** filters out pathogens and other foreign substances from the blood, helping to activate the immune system. - **Producing antibodies**: The **Spleen** produces antibodies, which are proteins that help to fight off infections. ### Significance The **Spleen** is an essential organ that plays a critical role in maintaining the body's overall health. Without a functioning **Spleen**, the body would be unable to filter the blood, store red blood cells, and activate the immune system. The **Spleen** is also important for maintaining a healthy balance of red blood cells and platelets in the body. **INFOBOX:** - **Name:** Spleen - **Type:** Organ - **Date:** Ancient civilizations (Egypt, Greece) - **Location:** Upper left region of the abdomen - **Known For:** Filtering the blood, storing red blood cells, activating the immune system **TAGS:** spleen, anatomy, lymphatic system, immune system, blood filtration, red blood cells, platelets, white blood cells, antibodies.