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The spleen is a small, fist-sized organ located in the left side of the abdominal cavity under the diaphragm. It is part of the lymphatic system, which is a subdivision of the immune system. The spleen acts as a blood filter, removing old red blood cells and holding a reserve of blood, which can be valuable in case of hemorrhagic shock. It also produces white blood cells and antibodies to help fight infection. While the spleen is not a muscle, it is possible to live without one, although this will weaken the immune system and increase the risk of infection.
| Characteristics | Values |
|---|---|
| Definition | An organ found in almost all vertebrates. |
| Structure | Similar to a large lymph node |
| Function | Acts as a blood filter, plays a role in red blood cells and the immune system. |
| Colour | Purple |
| Location | Upper left region of the abdomen, behind the stomach and under the diaphragm. |
| Size | About the size of a fist or an avocado. |
| Weight | Between 1 oz (28 g) and 8 oz (230 g) in healthy adults. |
| Shape | Rounded catcher's mitt with notches on the upper front edge. |
| Texture | Soft and smooth. |
| Surgery | Splenectomy |
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What You'll Learn
The spleen is an organ, not a muscle
The spleen is an organ located in the left hypochondriac region of the abdomen, just behind the stomach and under the diaphragm. It is a soft, purple, fist-sized organ, encased in a thick connective-tissue capsule. The spleen is part of the lymphatic system, which is a subdivision of the immune system.
The spleen has several important functions in the body. Firstly, it acts as a blood filter, removing old, malformed, or damaged red blood cells from circulation. This process also involves degrading the hemoglobin contained in these red blood cells into a readily excretable pigment and an iron molecule. The iron is then recycled and used to produce new hemoglobin. Additionally, the spleen stores blood and can release it back into circulation when needed, such as in cases of hypovolemia or hypoxia.
The spleen also plays a crucial role in the immune system. It produces white blood cells, antibodies, and lymphocytes, which help protect the body from infection. The spleen is a centre of activity for the mononuclear phagocyte system, and its absence can predispose individuals to certain infections. Furthermore, the spleen releases monocytes that promote tissue healing upon severe tissue injury, such as a heart attack.
While the spleen is not a muscle, it is connected to several ligaments, including the gastrosplenic ligament, splenorenal ligament, colicosplenic ligament, and phrenocolic ligament. These ligaments provide structural support and facilitate the attachment and insertion of blood vessels. The spleen is a highly vascular organ, containing many vessels that carry and circulate fluids in the body.
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The spleen is part of the lymphatic system
The spleen is a small organ located on the left side of the body, under the ribs and above the stomach. It is about the size of a clenched fist and is well-supplied with blood.
In addition to its role in the lymphatic and immune systems, the spleen is also part of the mononuclear phagocyte system. It houses antibody-producing lymphocytes in its white pulp and monocytes, which remove antibody-coated bacteria and blood cells through blood and lymph node circulation. The spleen releases monocytes to the site of severe tissue injury, such as a heart attack, where they regulate inflammation and facilitate tissue healing.
While the spleen performs many important functions, it is not essential for survival, and some people are born without one. This condition is known as asplenia. In cases where the spleen is damaged or diseased, it can be surgically removed in a procedure called a splenectomy. Following a splenectomy, the liver takes over many of the spleen's functions. However, people who have had their spleens removed are at a higher risk of infection and may be more susceptible to certain diseases as they age.
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The spleen is located in the upper left region of the abdomen
The spleen is an important organ with several functions. It is a major site for the destruction of old red blood cells and plays a role in recycling iron. The organ acts as a blood filter and helps maintain fluid balance in the body. It also produces white blood cells, antibodies, and substances that fight infection and promote healing. The spleen is part of the lymphatic system and is similar in structure to a large lymph node.
The spleen is divided into two regions: the anterior gastric portion and the posterior renal portion. The gastric surface is directed forward, upward, and towards the middle, while the renal surface is directed medialward and downward. The spleen is connected to the stomach by the gastrosplenic ligament and is also related to the pancreas, left kidney, and occasionally the left adrenal gland.
The spleen is susceptible to various conditions and injuries that can affect its function. Enlargement of the spleen, or splenomegaly, can occur due to certain infections, blood cancers, or other disorders. Rupture or bleeding of the spleen is a dangerous complication that requires immediate medical attention. In some cases, surgical removal of the spleen, known as a splenectomy, may be necessary due to damage or disease.
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The spleen filters blood and removes old red blood cells
The spleen is a small organ located in the left side of the abdominal cavity under the diaphragm, the muscular partition between the abdomen and the chest. It is about the size of a clenched fist and is well supplied with blood. The spleen is part of the lymphatic system, which is, in turn, part of the immune system.
The spleen's primary function is to filter blood and remove old red blood cells. It also stores blood and makes white blood cells and antibodies that help fight infection. It plays an important role in maintaining the levels of fluid in the body. The spleen holds a reserve of blood, which can be valuable in the case of hemorrhagic shock. It also recycles iron.
The spleen is encased in a thick connective-tissue capsule. Inside, the mass of splenic tissue is of two types, the red pulp and the white pulp, which are distributed throughout the spleen. The red pulp acts as a filter, removing waste from the blood and getting rid of old or damaged blood cells. It is the body's major site for the destruction of red blood cells, which have a lifespan of only 120 days. The red pulp also destroys bacteria and viruses. The white pulp is lymphoid tissue that usually surrounds splenic blood vessels. It is a part of the immune system and produces white blood cells and antibodies.
The spleen's ability to filter red blood cells has been the subject of several studies. Researchers have used computer modelling to show how the spleen maintains the quality of red blood cells in the bloodstream. The spleen contains tiny slits, called interendothelial slits, which red blood cells must pass through. These slits act as a "physical fitness test" for red blood cells, allowing only those that are healthy and the correct shape and size to pass through. When red blood cells are misshapen, they can become trapped in the spleen, leading to anemia.
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The spleen can be removed, but this weakens the immune system
The spleen is a small organ located in the left side of the abdominal cavity under the diaphragm, the muscular partition between the abdomen and the chest. It is about the size of a fist and is well supplied with blood. It is an important part of the immune system and plays a crucial role in defending the body against infection. The spleen stores and filters blood and makes white blood cells that protect the body from infection. It also produces antibodies that fight infection.
While the spleen performs many important functions in the body, it is not essential for survival, and people can live without it. The spleen can be removed through a surgical procedure called a splenectomy. During a splenectomy, surgeons use keyhole surgery (laparoscopy) to access the spleen and remove it without making large cuts. This results in less scarring and a potentially quicker recovery for the patient.
However, removing the spleen does weaken the immune system and increases the risk of infections. The spleen contains two types of tissues: the red pulp and the white pulp. The red pulp acts as a filter, removing waste, old, and damaged red blood cells from the blood. It also destroys bacteria and viruses. On the other hand, the white pulp, as part of the immune system, produces white blood cells and antibodies that help fight infections. Without the spleen, the body loses this filtration and disease-fighting mechanism, making it more susceptible to certain infections.
People who have had their spleens removed are advised to take certain precautions to stay healthy. They may need to take low-dose antibiotics for an extended period to prevent bacterial infections. It is also recommended that they stay up-to-date with vaccinations, including against preventable diseases like influenza. Additionally, those without a spleen are advised to avoid areas where malaria is present, as they are at an increased risk of developing severe malaria.
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Frequently asked questions
The spleen is an organ found in almost all vertebrates. It is part of the lymphatic system, which is a subdivision of the immune system. The spleen is located in the left side of the abdominal cavity under the diaphragm.
The spleen acts primarily as a blood filter. It removes old red blood cells and holds a reserve of blood, which can be valuable in case of hemorrhagic shock. It also produces white blood cells and antibodies that help fight infection.
Yes, it is possible to live without a spleen. The liver can take over many of the spleen's functions. However, people without a spleen have a higher risk of developing serious infections and severe malaria.
"Venting your spleen" is a phrase used to describe letting out anger or frustration. This is because, in medieval times, the spleen was thought to be the physical source of a hot temper.
The spleen is purple in colour and is about the size of a fist or an avocado.
