Multiple Choice
Foreign substances that elicit an immune response are termed:
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41. Immune System
Immune System
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Which of the following is the largest lymphatic organ, lined with macrophages that help filter blood?
A
Lymph nodes
B
Spleen
C
Thymus
D
Tonsils
Verified step by step guidance1
Step 1: Understand the function of the lymphatic system. The lymphatic system is responsible for maintaining fluid balance, filtering pathogens, and supporting immune responses. It includes organs such as lymph nodes, spleen, thymus, and tonsils.
Step 2: Review the role of each organ listed in the options. Lymph nodes filter lymph fluid and house immune cells. The thymus is involved in T-cell maturation. Tonsils trap pathogens entering through the mouth and throat. The spleen filters blood, removes old red blood cells, and contains macrophages to fight infections.
Step 3: Identify the largest lymphatic organ. The spleen is the largest lymphatic organ in the body, located in the upper left abdomen. It plays a key role in filtering blood and supporting immune functions.
Step 4: Understand the role of macrophages in the spleen. Macrophages in the spleen engulf and destroy pathogens, cellular debris, and old red blood cells, contributing to the filtration process.
Step 5: Confirm the correct answer based on the description. The spleen is the largest lymphatic organ lined with macrophages that help filter blood, making it the correct answer.
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