Textbook Question
The lymphoid organ that filters the blood is the ______, and the lymphoid organ that filters the lymph is the______.
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20. The Lymphatic System
Overview of Lymphoid Organs
Problem 6
Textbook Question
Red blood cells that are damaged or defective are removed from the bloodstream by the
(a) Thymus
(b) Lymph nodes
(c) Spleen
(d) Tonsils
Verified step by step guidance1
Understand the function of each organ listed in the options: The thymus is primarily involved in the maturation of T-cells, lymph nodes filter lymph and house immune cells, the spleen filters blood and removes damaged or defective red blood cells, and tonsils are involved in trapping pathogens entering through the mouth or nose.
Recall that red blood cells (RBCs) have a lifespan of approximately 120 days, after which they become damaged or defective and need to be removed from circulation.
Identify the organ responsible for filtering blood and removing damaged or defective RBCs. The spleen is the organ specialized for this function, as it contains macrophages that break down old RBCs and recycle their components.
Consider the anatomical location and role of the spleen: It is located in the upper left quadrant of the abdomen and acts as a blood reservoir, filtering blood and removing old or damaged cells.
Conclude that the correct answer is the spleen, as it is the organ responsible for removing damaged or defective red blood cells from the bloodstream.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Red Blood Cell Function
Red blood cells (RBCs) are essential for transporting oxygen from the lungs to the body's tissues and returning carbon dioxide to the lungs for exhalation. They are produced in the bone marrow and have a lifespan of about 120 days. Damaged or defective RBCs can impair oxygen delivery, making their removal from circulation crucial for maintaining overall health.
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Spleen Function
The spleen is an organ located in the upper left abdomen that plays a vital role in filtering blood. It removes old or damaged red blood cells and recycles iron and other components. The spleen also helps in immune responses by producing lymphocytes and filtering pathogens, making it a key player in maintaining blood health.
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Immune System Organs
The immune system comprises various organs, including the thymus, lymph nodes, and tonsils, each serving distinct functions. While the thymus is involved in T-cell maturation and lymph nodes filter lymph fluid, the spleen specifically targets blood filtration and the removal of defective RBCs. Understanding these roles helps clarify why the spleen is the correct answer in this context.
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