Lymph Node
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Example:
Imagine your kitchen sink strainer catching food scraps to prevent them from clogging the drain. Similarly, a lymph node acts as a filter, trapping pathogens from the lymph fluid to prevent them from spreading through the body. Just like the strainer allows water to pass while catching unwanted debris, lymph nodes let clean fluid through while containing lymphocytes to deal with harmful invaders, ensuring the body's internal 'drainage system' remains clear and functional.
Practice Version
Lymph Node: An organ that filters pathogens from lymph, it contains lymphocytes. Lymph node. Lymph nodes are small structures in your body that help fight infections by filtering harmful substances and storing immune cells.